Manual / Guide
An English-language technical description, operating and maintenance text for the G3, printed by a US publisher with H&K's permission (it states it is not an official manual). The HK PSG1 dive uses it for the G3 receiver, barrel and technical data the PSG1 shares.
AUTOMATIC RIFLE Caliber 7.62 mm x 51 Nato HECKLER & KOCH GMBH OBERNDORF/NECKAR GERMANY HECKLER & KOCH have authorized SURVIVAL BOOKS INC. to publish this unofficial edition of the HK G3. manual, This is not an official manual, the part numbers, accessories, and some of the tachnical data are not current and the manufacturer should not be contacted regarding the contents. This is printed with the kind permission of the manufacturer to assist firearms collectors, students, gunsmiths, and military and law enforcement personnel, TECHNICAL DESCRIPTION OF THE AUTOMATIC RIFLE HK G3 Part 1: Description of the Weapon and Accessories Part 2: Operating Instructions and Maintenance This is not an official manual. Under no circumstances shall the reader contact the manufacturer regarding any data presented in this pamphlet. hin HECKLER & KOCH GMBH OBERNDORF/NECKAR GERMANY Copyright © HECKLER & KOCH INC. Ta an Si TABLE OF CONTENTS 1. 1.1. Lad, 1.1.2, 1.1.4, 1.2. 1.3. 1.4. 1.5. 1.5.1. 1.5.1.1, Lat, 1.5.1.3. 1.5.1.4. 1.5.1.8. 1.5.1.6, 1.5.1.7. 1.5.1.8. 1.6.2, 1.5.2.1. 1.5.2.2. 2.1. 2.1.1. 2.1.2, 2.1.2.1. 2.1.2.2. 2.1.2.3. 2.1.2.4. 2.1.2.5. 2.1.2.6. Description of the weapon General information Dasignation Applicability General description General Illustrations Assembly groups Tachnical data Technical deseription Construction Barrel with receiver, loading mechanism and sights Bolt assembly Grip assembly with trigger mechaniam Back plate with butt stock Handguard Magazine Optical sighting devices Training equipment . Operation Bolt Trigger mechanism Operating instructions including maintenance Operating instructions Principles on handling and operation Preparation of the rifle for firing Loading Firing Unloading Filling and emptying of | magazine Launching of rifle grenades Firing with training equipment A" fu | a oo oo eA me a a ee 14 16 19 21 2? 27 29 a7 a7 a7 a7 38 sa888 2.1.3. 2.1.3.4, 2.1 a Bee 2.4.8. 22. ‘al 1 2.2.2. 223. 2.2.4, ooh 22.6. 2.27. Employment of the weapon with optiont sighting devicwa 6 www ls G3 talascoplo sight wih mount... ...- Infra-red night alghting devices with mount Employment of the weapon on extreme climatic conditions . hdainteneance General . 2. Digsesembly and reassembly of rifle and training equipment fer cleaning Time achedule for maintenance _ - Maintenance inetructiongp 8... lw le Special hints regarding means and tools for maintenance Functioning teat . Causes of malfunction and thelr elimination py the rifieman . H2t FES &G 41 1 * i 1.1. GENERAL INFORMATION 1.1.1, Designation Rifle 7.62 mmx 51 Fig. 1: Rifle G3A3 1.1.2. Applicability The Rifle G3 is an automatic small arm which permite to fire single shots or short bursts fram all firing positions. 1.1.3 General description The salient features of the G3 are simple handling, instant combat readiness, excellent accuracy and high firapower. It is light of weight, most reliable in its functions and ite parts are fully interchangeable. The G3 is a recoil-operated weapon with fixed barrel incorporating a split blow- back locking system. Cartridges are fed from a 20-round magazine or, In case, inserted manually. Rifle grenades can be launched from this weapon. This, however, requires a pro- pellant charge. A blank attachment makes the firing of blank cartridges possible, The subcalibre conversion kit is a training equipment to the Aifla G3 fer the firing of 5.6 mm x 16 subcalibre ammunition. In case of practice firing the G3 standard bolt assembly can be replaced by a bolt for the firing of plastic training ammunition. Tha excellent firing accuracy permite the use as sniper rifle, With the provided telescopic sight the G3 can be used as a sniper rifle. With the Rifle G3 cartridges 7.62 mm x 51 of all NATO countries can be fired. 1.2. GENERAL ILLUSTRATIONS Fig. 2: G3A3 fram the left Fig. 3: G3A3 from the right Weapon G3A3 with plastic butt stock and plastic handguard. Handguard fixed at the loading lever housing (free floating barrel). Fig. 4: G3A3 ZF from the left Fig. 5: G3A3 ZF from the right Vieapon G343 ZF, same version as G3A3, but with telescapic sight. 2 Fig. 6: G3A4 from the left Fig. 7: G34A4 from the right Weapon G3A4 with retractable butt stock, plastic handguard fixed at the loading lever housing (free floating barrel}. 1.4. TECHNICAL DATA Calibre 7.62 mm x 51 NATO Length of the weapon with rigid butt stock 40.15 In. (1020.00 mm) Length of the weapon with retractable butt stock 31.49 in. { 800.00 mm) Breadth of the weapon 1.77 In. ( 45.00 mm) Height of the weapon with magazine 8.66 in. { 220.00 mm) Length of the barrel 17.71 in. ( 450.00 mm) Distance between sights 22.48 in- ( 572.00 mm) Length of twist, permanently to the righthand 12.00 in. ( 305.00 mm) Number of the grooves 4 Number of the chamber grooves 12 Weight of the weapon with rigid butt stock, without magazine 9.97 lbs. (4.25 kg) Weight of the weapon with retractable butt stock, without magazine 9.96 Ibs. (4.52 kg) Weight of the aluminium magazine, filled 21.95 oz. (0.622 kg) Weight of the steel magazine, filled 26.54 oz, (0.752 kg) Cyclic rate 500 - 600 r.p.m. Muzzle velocity - ¥, - 2559-2624 f.p.s. (780 - 800 m/s) Muzzle energy - E, - 2098-2170 ft. lb. (290 - 300 mkqg) Sighting graduation 100, 200, 300 and 400 metres Longest range 4046 yd. (3700 m) Normal range of use upto = 4.37 yd. { 400 m) safety limit in the firing direction 4370 yd. (4000 m) Safety limit on each side 1093 yd. (1000 m) Protruding point of the firing pin 1.45 mm Distance between bolt head and bolt head carrier 0.5 - 0.1 mm 1.5. TECHNICAL DESCRIPTION 1.5.1. Gonstruction ery Se CA ————e a Fe ees Fels w > 2 Fig. 9: Cross section 1.5.1.1. Barrel with receiver, loading mechanism and sights — oD oO 4 oO Bb Ww Ag — es ne — (Fig. 10 and 11) Fig. 10: Components, barrel, receiver, loading mechanism and sights Receiver with barral, loading housing, front sight holder, and release lever Barrel Cylindrical pin Front sight holder Flash hider Cap Bush for release lever Release lever Clamping sleeve Contact button for magazine catch Magazine catch Contact piece for magazine catch 13 14 15 16 if 18 19 21 22 23 24 25 Contact spring for magazine catch Pin for stop abutment Axis for loading handle Loading handle Elbow spring for loading handle Contact piece for loading handle Fix plate for sight support Locking washer Binding screw Rotary rear sight Compression spring for ball catch Ball Adjusting screw The receiver (11/1) contains the barrel (11/2), loading mechanism (11/4) and sights (11/6). 2 Fig, 11: Barrel with recelver, loading mechanism and sights On the right and left side of the recelver grooves are impressed to guide the bolt and to seat the back plate. In front there are two openings to receive barrel ex- tension and barrel, as well as the loading lever housing (11/5). Tha back plate closes the receiver at the rear. The lower rear part of the receiver ise box-type shaped and provided with 2 tubular rivets to store the locking pins linking the grip assembly and the back plate to the receiver. At the front part of the receiver are the magazine shaft and the magazine catch, two holes with bushes for the locking pins of the grip assembly. Qn the right side of the receiver is the ejection part. The sight base is welded on the receiver, The telescopic sight mount is located on the front part of the sight base. On the left and right side of the receiver are 4 recesses for the engaging of telescopic sight mount and clamping claws. The magazine shaft serves in connection with the magazine catch (10/11) to lo- cate and fix the magazine. The loading lever housing is inserted in the recelver and spot-welded. A U-shaped bow (11/3) is welded on to the front end of the loading lever housing for the lo- cating of the handguard locking pin. The loading lever housing has on its left side a longitudinally slotted hola which has at its end an extension to the right side in which the loading lever engages (10/16). In thie slotted hale slides the loading lever with Its spring (10/17) and support (10/18). With the loading lever and support the bolt is drawn back com- pressing the recoil spring simultaneously. In front the support and the loading lever are limited by the stop abutment. The stop abutment is attached to the loading lever housing by means of a rivet (10/14). At the left side this riveted pin emerges as a stud. The loading lever engages on it when the bolt snaps forward. The loading lever housing is closed in front by a cap (10/6); a set bolt with spring holds the inserted cap in the front sight (10/4). 8 Barrel (Fig. 12) In the barrel the cartridge is fused and given motion, direction and twist (right- handed twist), The interior of the barrel consists of the chamber (1) and the rifled part (2). In the latter are 4 grooves, HMI L ! | jes Fig. 12: Barrel which have a constant twist to the right. The chamber hae 12 flutes which facili- tate the extraction of the cartridge case utilizing the gas pressure. The muzzle ia provided with a thread where the flash hider (3) or rather the blank attachment can be screwed on. Behind the thread a centering shoulder is located for better guidance while screwing on. The longitudinal grooves behind the centering shoulder serve as catches for the retaining spring of the flash hider or rather of that of the blank attachment. Flash hider (Fig. 13) The two functions of the flash hider (1) are to hide the muzzle flash and to guide the rifle grenade. The longitudinal slots in its front part split thea muzzle gasses. At the rear a retaining spring (2) Fig. 13: Flash hider is set which engages in the notches and prevents the flash hider or rather the blank attachment from loosening. The flash hider is screwed on until it is in tight contact with the muzzle of the barrel. Rotary rear sight device (Fig. 14, 15 and 16) The sighting device consists of the fixed front sight with front sight holder (14/1) and the rotary rear sight which is adjustable in the vertical and horizontal direc- tion (14/2). The rotary rear sight (notch) and diopter holes may be turned from position 1 to 4. These figures correspond to distances fram 100 to 400 metres. Position "1" is an open ¥-sight, in the positions “2, 3 and 4° diopter holes are used. Position "2" serves as basic sight. The open V-sight, corresponding to a distance of 100 m, is an auxiliary sight. Fig. 14: Rotary rear sight device 10 The front sight holder (15/1) with bush for front sight holder (15/2) is set on the barrel and soldered softly to the latter. In addition to that the front sight holder is rivated on the barrel by meana of an eyebolt (15/3) which also serves to attach the carrying sling. In the front part of the front sight holder is the snap ring (15/4) which prevents the rifle grenade from slipping off. The uppermost part of the front sight is developed as a protection of the sight. The front sight (15/5) is pushed Into a longitudinal slit and fixed by a clamping sleeve (15/6). Fig. 15: Front sight holder Fig. 16: Rotary rear sight The sight base (16/1) is welded on the receiver and the sight cylinder (16/2) with Ite thread screwed on the sight support (16/3). The two catch bolts (16/4) and catch bolt springs (16/5) are located between the rotary screw socket in the sight Support and the sight cylinder. The ball (16/6) and compression spring (16/7) press against the screw socket and lock the sight cylinder In the adjusted shooting distance, With fix plate (16/8), locking washer (16/9) and Binding screw (16/10) the sight support is screwed on the sight base. The rotary rear sight is adjusted by means of the adjusting screw (16/11). 11 1.5.1.2. Bolt assembly (Fig. 17) 1 Bolt head carrier with check laver 8 Clamping pin 2 Cylindrical pin 8 Roll holder 3 Check lever 10 Locking rollers 4 Compression spring 11 Locking piece 5 Bolt head 12 Firing pin spring 6 Extractor spring 13 Firing pin 7 Extractor Fig. 17: Locking piece The bolt locks the barrel at tha moment of fire, it is guided in the receiver and feeds the cartridge, extracts and ejects the cartridge case, and cocks the hammer. 12 The bolt head carrier along with the recoil spring tube (1) carries the belt head (5). On both sides it has studa whereby It slides in the guiding grooves of the re- ceiver. In its longitudinal bore lles the firing pin (13) with the firing pin spring (12) and the locking piece (11). In its recess at the front side it receives the bolt head. At the upper left side of the bolt haad carrier sits the bolt head locking lever (3) with bolt (2) and spring (4). The bolt head locking lever retains the bolt head by means of its shoulder at the moment the locking takes place, and a rebounding of the bolt is thus impossible. The recoil spring tube of the bolt head carrier racelves the recoll spring with re- coil spring tube and the abutment for the guide ring of the recail spring. Balt head and locking piece are seated in the bolt head carrier and are held by the bolt head locking lever at the shoulder. It is bored and milled in order to guide the front part of the locking piece, the firing pin and the locking rollers (10) with their holding plate (9). The lower side of the bolt head Is of rib-type shape. It con- tains a longitudinal groove for the ejector and milled-out portions to give free access to the lips of the magazine. The semicircular shoulder confines the move- ment of the Inserted bolt head in the longitudinal direction. The extractor (7) is located at the face of the bolt head. It is held by the extractor spring (6). With its extracting claw it gets hold of the cartridge case at the cir- cular groove, The locking piece in connection with the locking rollers regulates the locking and unlocking of the bolt head in the barrel extension. Its foremost part, which ja flattened, slides in the bolt head. Its cylindrical rear has a nose which holds it in the bolt head carrier. The locking plece is drilled along its longitudinal axis for the guidance of the firing pin. The firing pin fires the cartridge. It is guided in the bolt head, the locking plece and the bolt head carrier. Its collar serves as abutment for tha firing pin spring. 13 1.5.1.3. Grip assembly with trigger mechanism (Fig. 13) Grip assembly Trigger assembly Locking pin Grip Cylinder screw Toothed washer Safety mechanism “all OG fe a ho The grip assembly (1) serves to the ingertion of the trigger assembly (2) and is fixed to the receiver by means of the locking ping (3). The grip (4) is slipped over the grip assembly and fixed by means of a lens head screw (5) which is checked by a toothed washer (6). On both sides of the grip assembly angular supports are pressed in to receive the trigger assembly. The safety pin (7) fixes the trigger case inserted in the grip. The three-position selective fire lever is situated on the left side of the grip assembly providing for: S = safe {in white) E = single fire (red) F = burst (red) 14 A white mark on the face of the safaty pin indicates also on the right side of the grip assembly the corregponding position of the selective fire laver. Fig. 19: Safety mechanism - left side of the weapon Fig. 20: Safety mechanism - right side of the weapon The grip assembly (2) receives all components of the trigger mechanism, hammer, ejector and safety mechanism. 15 1.5.1.4. Back plate with butt stock Back plate with rigid butt atock (Fig. 21) (1) 1 Butt stock with holder for buffer 5 Safety plate housing 6 Tubular rivet 2 Butt plate 7 Bush for tubular rivet 3 Buffer screw § Back plate with recall spring tube 4 Toothed washer 9 Driving spring 10 Guide ring 11 Stop pin 12 Alvet 13 Buffer assembly 14 Countersunk screw 15 Toothed washer 16 Locking pins Fig. 21: Back plate with rigid butt stock The back plate with butt stock closes the rear of the receiver. It is fixed to the latter by means of two locking pins (16). The buffer assembly (13) is located In the back plate. It is fixed above the holder for buffer housing (1) In front by means of 2 countersunk screws (143, and at the end by the buffer screw (3). The recoil spring tube is riveted In the upper part of the back plate. On the recoil spring tube slide the guide ring (10) and the driving spring (9), which are held by the stop pin (11). The butt stock (1} permits an adequate handling of the weapon and its putting against the shoulder. On the left side of the butt stock the sling holder is trimmed in. When the weapon is stripped, the tubular rivets (6) serve as place for the locking pins. The butt stock is closed by a plate (2), the two binding springs of which catch above the tube rivets and are thus fixed. 16 The buffer assembly (Fig. 22) io we Buffer screw Toothed washer Safety plate Countersunk screw Toothed washer Holder for buffer housing Closing screw Buffer spring Buffer bolt Buffer housing oOo Ow Ho bw hb —_ gu TTT Catlett 1) 1 7 == be SSS bionfatleicabtid oy Fig. 22: Buffer assembly The buffer assembly cushions the bolt after the shot has been fired, and throws It forward again in conjunction with the recoil spring. 17 (2) Back plate with retractable butt stock (Fig. 23) 1 Butt stock 7 Buffer bolt 2 Back plate 8 Buffer spring 3 Recoil spring 9 Buffer screw 4 Guide ring 10 Spring loaded gripping lever 5 Stop pin 11 Cap 6 AFivet 12 Gripping lever 13 Notched ring 14 Spring ring 15 Locking pin Fig. 23: Back plate with retractable butt stock The “back plate with retractable butt stock” can be replaced by the “back plate with fixed plastic butt stock”. The spring loaded gripping lever (10), the gripping lever (1 2) and the notched ring (13) are placed on the buffer housing. They are held by the spring ring (14). At the rear the cap (11) covers the back plate (2). Both guide rails are welded on to the convexedly formed butt plate. These two guide raila slide on the buffer housing and are led into the guide groove of the housing at mounted butt stock. A reinforced butt stock cover stabilizes the butt stock (1) when launching gre- nades. 18 The buffer assembly (Fig. 24) 1 Buffer screw 2 Buffer spring ; 3 Buffer bolt ‘aia a S 4 Compression spring \ | 5 Balt l , , 6 Back plate | —_ j - Saar ar 3 —j____ an F i ! ir f | ” = ———————————————— B | : | Fig. 24: Buffer assembly The compression spring (4) with bolt (5) is located in the buffer scraw (1). When unlocking the butt stock for extraction it is pushed out of its catch by means of the compression spring with balt (4 and 5). 1.5.1.6. Handguard (Fig. 25) The plastic handguard (1) cavers the barrel from below and facilitates the hand- ling of the rifle when the barrel is hot. The lining riveted into the handguard serves as protection against heating of the handguard. The locking pin (2) serves as fastening. Fig, 25: Handguard 1g 1.5.1.6. Magazine (Fig. 26 and 27) Magazine housing Follower Follower spring with safety plate Magazine cover & 1 ho The magazine receives the cartridges and assures the cartridge feed. It ls a straight box-type magazine and has a capacity of 20 cartridges. Fig. 26: Light metal magazine Besides the above described light metal magazine (Fig. 26) a steel maga- zine (Fig. 27) is available. Magazine housing Follower Follower spring Magazine cover ADR = Fig. 27: Steel magazine 1.5.1.7. Optical sighting devices (1) Teleacopic sight G3 with mount (Fig. 28) The telescopic sight is used when the Rifle G3 serves as sniper rifle. It enables the shooter to detect and aim at the target by day and In the dusk. The maximum firing range to be focussed amounts to 600 metres. At longer distances of the target it also makes the observation of the enemy and the effect on the target possible, The telescopic sight (1) is fixed to the mount (2) by two screws (3), The receiver of the weapon Is designed to receive a telescepic sight with mount, without any special arrangements. The telescopic sight mount is marked with the corresponding final number of the weapon. re: nA SLATES i OTe, tiseeg ee. i. Fig, 28: Telescopic sight G3 with mount (2) Infra-red night sighting device with mount (Fig. 29) The infra-red night sighting device is intended to be used in conjunction with the Rifle G3 for aiming and observation at night with infra-red spotlight. On night-operations it enables the shooter to observe and aim at infra-red illu- mination by means of the infra-red spotlight belonging te it. The infra-red night sighting device (1) Ie fixed to the telascopic sight mount (2) by two screws (3). The receiver of the weapon is designed to receive a telescopic sight mount with infra-red night sighting device without any special preparation, The telescopic sight mount is marked with the corresponding final number of the weapon, 21 Fig. 29: Infra-red night sighting device with mount 1.5.1.8. Training equipment (1) Blank attachment (Fig. 30) Blank attachment Retaining spring Cylindrical pin Nozzle bolt Cup spring in & toh = Fig. 30: Blank attachment The blank attachment (1) is a training device for the firing of blank cartridges. It is screwed on to the barrel instead of the flash hider. The retaining spring (2) in the rear part engages in the barrel shoulder making sure that the blank attachment does not get loose by itself. In the front part of the blank attachment the nozzle bolt (4) with cup springs (5) is placed, fixed by means of a cylindrical pin (3). The gas pressure can be regulated by turning the nozzle bolt. The blank attachment has a dull chromium-plated finish to distinguish it from the flash hider. (2) Plastic training breech block (Fig. 31) 1 Bolt head carrier 3 Firing pin 2 Bolt head with clutch piece 4 Firing pin spring Fig. 31: Plastic training breech block The plastic training breech block is a practice device for the firing of plastic training ammunition. It is inserted into the rifle instead of the normal bolt and is not suited for the firing of service ammunition, The weapon is fed with plastic training ammunition by means of the G3 magazine. Ze ee The dimensions of the bolt head carrier (1) correspond to those of the normal G3 bolt. A clutch piece is inserted firmly in the bolt head (2) and connects bolt head and bolt head carrier. (3) Subcalibre conversion kit (Fig. 32) Subcalibra tube E Bolt E Magazine E Container E rr | ~, llg — OR Fig. 32: Subcalibre conversion kit The conversion kit is a training device for the firing of ammunition, calibre 5.6 mm x 16 (.22 LA}. 23 Subecalibre tube E (Fig. 33) Subcalibre tube E Locking ring E Bore Milled surfaces Crosa slit te ha — Fig. 33: Subcalibre tube E The lang part (1) of the subcalibre tube E is placed in the G3 barrel, The locking ring E (2) on the tube prevents a loosening from the barrel extension at removed magazine and opened bolt. The subcalibre tube E is additionally fixed by means of a bolt on the magazine, engaging in the bore of the tube reception (3). The parallel sides (4) of the tube prevent it from being distorted in the receiver and barrel extension. The extractor enters Into the oblique recesses (5) at closed bolt position. The chamber and the cut-in grooves are in the barrel. Bolt assembly E (Fig. 34 and 35) The bolt assembly E locks the subcalibre tube E when firing. It Is guided in the receiver and feeds and ignites the cartridge, extracts and ajects the empty case and cocks the hammer. Guide rod E Bolt head carrier E Bolt head E with extractor Recall spring E Guide sleeve E Disc Buffer spring Safety plate ne Oe Fig. 34: Bolt assembly E & ih i = oh on 24 The bolt head E with extractor (34/3) connected with the guide sleeve E (34/5) is inserted In the bolt head carrier E (34/2). On the quide red E (34/1) the racall apring E (34/4) with disc (34/6), buffer spring (34/7) and safety plate (34/8) are placed. The bolt head carrier is activated only when the weapon is cocked. Bolt head E (Fig. 35) The bolt head E (34/3) with extractor is placed in the bolt head carrier ( 34/2). 1 Balt guide E 5 Firing pin spring 2 Extractor 6 Limit stop 4 Shock absorber 7? Guide plate E 4 Firing pth 8 WU-clip 5. 4 tt ff am 2 Fig. 35: Bolt head E with follower The extractor (35/2) is detachably inserted in the bolt guide E (35/1), which receives the shock absorber (35/3) and the firing pin (35/4). The firing pin spring (35/5) and the compression spring are received by the shock absorber, the counterbearing of which Is formed as limit stop (35/6). The guide plate E (35/7) Is located on the rear side of the bolt guide, and at the recoil of the bolt it presses the hammer downwards with its ramp placed on the lower side. The U-clip E (35/8) locks the bolt guide above the limit stop. 20 Magazine E (Fig. 36) The magazine E contains the cartridges and sesures the cartridge feed. It is a bar- type magazine and has a capacity of 20 cartridgas. Magazine housing E Follower spring Magazine cover Follower Follower spring with safaty plate Magazine cover oon & fo hoa a | i A subcalibre magazine housing with filling piece is firmly fitted in the G3 standard magazine housing E (1). The follower spring = 2 (5) seizes the subcalibre magazine hou- = sing and the magazine cover (6) covers = the lower part of the standard magazine 2 housing. : ; = Fig. 36: Magazine E Container E (Fig. 37) The container receives the conversion kit E. 1 Subcalibre tube E 2 Bolt assembly E 3 Magazine E 4 Cleaning kit, cal. 5.6 mm to 6.5 mm ‘ies WS oe ier eee ee Te te ay ae = ly Bd A | j ut | 1.5.2. Operation 1.5.2.1. Bolt (Fig. 38, 39 and 40) The weapon ls loaded, cocked and ready to fire. By pulling the trigger the cocked hammer is released and strikes the firing pin (38/4) which firas the cartridge (38/1) with its point. The powder gas drives the projectile down the barrel (38/5). At the same time powder gasses are forced agalnst the cartridge case. The car- tridge case transmits a part of the gas pressure to the bolt head (38/2) and there- by the backward movement is initiated. 1 Cartridge 5 Barrel 2 Bolt head 6 Barrel extension 3 Locking piece 7 Locking roller 4 Firing pin 8 Bolt head carrier 1 2 3 & BS SSF Z. ZLib a F y & ee a] we TSS ‘Leessneen Fig. 38: Bolt in locked position Thus the bolt head carrier (38/8) is actlvated by means of the locking rollere (38/7) and the locking piece (38/3) in the proportion 1:4, on which occasion the locking rollers remain locked until the bullet has left the barrel. The locking rollers emerge from the recesses (39/1) in the barrel extension (38/6) and are pressing against the inclined faces of the locking piece. The locking piece slides back and the locking rollers slip into the bolt head as far as necessary to unlock the bolt. Sore Ze PUPTTPA, SEE Renner x SS Fig, 39: Balt in unlocked position 27 The locking piece with ita shoulders hits the bolt head carrier and gives additional apeed to same. Yhila sliding to the rear the locking lever (40/1) engages from the Balt head. SS * Fig. 40: Disengagement of the locking lever | Bolt head and bolt head carrier separate themselves to a distance of about 5 mm but move further backwards together. While the bolt head is moving backwards the hammer is “cocked”, the recoil spring compressed, the cartridge case held by the extractor thus hits the ejector and is ejected. In its rearmost position the bolt hits the buffer and is stopped. At the forward movement the energy of the expanding recoil spring and the ex- panding buffer spring pushes the bolt forward. The cartridge on top In the maga- zine la inserted into the chamber by the front surface of the bolt head. The ex- tractor hocks into the ring groove of the base of the cartridge case. The locking piece with ita declining faces pushes the locking rollers outwards until they support themselves in the barrel extension (38/6), which locks the weapon. At tha moment the locking takes place the locking lever steps (Fig. 40) in front of the shoulder of the bolt head and prevents the bolt head to rebound. The weapon is once more ready to fire. 28 EE ES. &—<—_— = — 1.5.2.2. Trigger mechanism (Fig. 41-51) Bolt head carrier Firing pin Release lever Anvil for hammer Trigger spring Hammer Safety pin sm on & fo Aa 10 11 12 Pressure shank and pressure spring Catch Elbow spring with roller Trigger lever Trigger Fig. 41: Safety mechanism at The weapon is loaded and the hammer (41/6) is cocked. The safety lever (41/7) put on “S" = safe. In this position the trigger (41/12) is blocked by the safety pin and cannot be pulled. position "S* = safe Before firing The safety laver put on position “E" = single fire. At single fire the trigger lever (41/11) in connection with its oblong hole (43/1), the safety pin (41/7), the elbow spring with roller (41/10), the catch for elngle fire (42/3) and the eatch for trigger lever (42/4) as disconnector comes into action. 1 Sliding surface 4 Catch for trigger lever 2 Catch for burst 5 Recess for single fire 3 Catch for single fire Fig. 42: Functioning position of trigger parts at position "E" = single fire The trigger lever with its oblong hole can be shifted about 1.5 mm in its longitu dinal direction. 1 Oblong hole 1 2 Compression bolt with spring | 3. Trigger rollers 4 Surface centre of pressure | oa z a 4 Fig. 43: Trigger lever In unoperated position, which means without pressure from the hammer, the trigger lever is steadily being pushed forward by means of its pressure bolt with spring (42/2), As scon as the hammer with its single fire notch (42/3) comes in connection with the trigger lever, the latter is pushed backwards overcoming the power of the pressure bolt and its spring. (Note direction of arrow in Fig. 43). This shert longitudinal movernent causes a single shot. The catch with its roller (41/10) pushes at single fire the trigger lever steadily against the hammer notch. Single fire (Fig. 44) The bolt body presses the release lever (41/3) and thus the sear catch (41/3) forward. The hammer (41/6) is only retained by the trigger lever (41/11). } ! Es Fig. 44: Sricle fire function - centre of pressure - When pulling the trigurr its extending lever with its recess reaches into the groove of the safety pi: limiting the movement of the triqger. At the same time the rear part of the trigger lever is being lifted, the front part lowers and disengages from the single fire notch. Fig. 45: Releasing of hammer 31 The hammer is released (Fig. 45), hits the firing pin and fires the cartridge (Fig. 46). ee SON | Fig. 46: Firing At this moment the pressure on the trigger lever coming from the hammer is being taken off and the trigger lever goes forward (Fig. 47). Fig. 47: After firing The trigger i still being locked. With the forward movement of the trigger lever Ite rear part snaps under the pressure of the elbow spring with roller into the trigger lever notch (42/4). 32 Backward movement Alter the cartridge has left the barrel, the bolt goes back and the bolt head carrier pushes the hammer backwarda (Fig. 48). Fig. 48: Bolt backward movement First the hammer engages in the notch for “single fire" (Fig. 49), shortly thereatter the sear catch engages in the notch for “buret~ (Fig. 50). At the first engagement the trigger lever moves backwarda, at the second engagement it comes forward again. Fig 49: Hammer engaging in Fig. 50: Sear catch engaging the notch for single fire. in the natch for burst. Forward movement The bouncing off from the buffer and the pressure of the releasing recall make the bolt head carrier move forward. The climbing ramp of the bolt head carrier (42/1) presses the release lever downwards which raleases the catch. The hammer cannot strike, but is caught on the trigger lever. The trigger lever is jammed between the notch for single fire and the trigger lever notch. In this position the sequence Is interrupted. To fire another shot, the trigger must be released. After the trigger is released, the trigger lever (43/3) comes down and releases the rear part of the trigger lever. Due to the pressure from the hammer the trigger lever is pushed back, as far as the longitudinal hole makes it possible and rests over the pull-off surface (43/4). The condition for the next shot is given. Should another shot be fired, the trigger ia pulled until the pull-off (Fig. 44). Further pull of the trigger lifts the rear part of the trigger lever, while the front part disengages fram the notch for single fire (42/3). The cartridge is fired and all functions repeat themselves, Burst (Fig. 51) 4 turn of the safety lever to “F* = burst also turns the safety pin which brings the groove in front of the extended trigger arm. oe SJ Ok fe Cs, a Fig. 51: Burst function When the shooter pulls the trigger, all of the extended arm enters in the groove of the safety pin causing a longer trigger pull and the trigger lever is out of reach of the notch for single fire. The harmmer is held only by the catch in the notch for burst (Fig. 50). 34 With every shot the release lever makes a guided motion caused by the climbing ramp of the bolt head carrier (42/1) and the catch emerges from the notch for burst. The hammer strikes the firing pin, as nothing interferes with its motion. This sequence is called automatic fire. Short interruptions of tha automatic fire result in burats. The weapon ceases to fire when the trigger is released. The front part of the trigger swings up again and the hammer is caught in the notch far single fire. Note! At single fire: The interruption of the eyclic rate is caused through the trigger lever in connection with the position of the safety pin, the longitudinal hole on the trigger lever, the elbow spring with roller, the single fire notch, the trigger lever notch. ae At automatic fire: he interruption takes place: 1. owing to the position of the safety pin, which gives a longer trigger pull, 2. owing to the trigger lever which swings down until it is out of reach of the notch for single fire, 3. by means of the release lever through the catch releasing the hammer at the moment the locking takes placa. This results In an uninterrupted cyclic rate until a} the trigger is released, b) the magazine is empty. 1.6. Outfit 1.6.1. Accessories (Fig. 52) 1 Carrying sling 2 Muzzle cover 3 Cleaning kit for weapons cal. 7.62 mm-§ mm 4 Cleaning kit for weapons cal. 5.6 mm -6.5 mm 5 Magazine carrying bag Fig. 52: Accessories 2.1. Operating instructions 2.1.1. Principles on handling and operation The rifle is always to be handled as if it were loaded and ready to fire, é. The safety pin has to point continuously at position "S* = safe. Only shortly before firing it has to be turned to position “E“ = single fira or “F" = burst. 3. In handling the weapon one seizes it at the grip. When cocking, locking and loading, ae well aa when uncocking and unloading it, the muzzle has to point to the upper side. 4, Biank- and subcalibre ammunition may be employed only when using the train- ing equipment (note para 1.5.1.8.) provided for it. 2.1.2, Preparation of the rifle for firing Before loading and firing: 1. Free barrel bore from oil 2. Check, if bolt and safety mechanism function properly 3. Magazine must engage properly 4. Check, if the flash hider or rather the blank attachment fits firmly. 2.1.2.1, Loading Before loading: — Put safety pin on "S" = safe. — Retract the loading lever and put it in the recess of tha loading lever housing. — Insert filled magazine in tha magazine shaft until it engages. — Let the operating handle snap forward. — The rifle is loaded and safe. Fig. 53; Insertion of the magazine af 2.1.2.2. Firing — Unlock the weapon — Turn the safety pinta “E* or “F" — Operate the trigger. When the fire is interrupted or ceased, the weapon has to be locked. 2.1.2.3. Unloading — Check whether safety pin is at "S* = safe. — Take out the magazine by pushing the release lever forward. — Draw the loading lever rearward (the cartridge is ejected) and let the lever énap forward. Fig. &4: Removal of magazine 2.1.2.4. Filling and emptying of magazine = Hoe — When filling the magazine press the cartridges ‘z separately under the magazine lips. i — When emptying the magazine grasp it with one hand so that the points of the cartridge palnt downwards. — Press the second cartridge down by means of a wooden chip, whereby the top cartridge falls out by itself. — Catch falling-out cartridges, e.g. by placing the steel helmet underneath if necessary. Fig. 55: Emptying of magazine 38 2.1.2.5. Launching of rifle granades — Lock the rifle. — Remove the magazine. — Retract loading handle and put it in the recess on the loading laver housing. — Insert propellant charge manually into the chamber (Fig. 56), — Have the bolt with loading handle snapped forward. — Push the rifle grenade over the flash hider until the abutment of the front sight holder. Note that the spring ring retains the grenade. Tha rifle is ready to fire. Fig. 57: Mounted rifle grenade 33 2.1.2.6. Firing with training equipment {1} Blank attachment — Lock the rifle. — Unscrew flash hider. — Screw on blank attachment and tighten (manually). — Load the rifle. — Fill magazine with blank cartridges and Insert magazine. — Unlock the rifle — Set selective fire lever at “E~ or "F". — Pull trigger. At Interruption or cease of fire the weapon is to be locked. When regulating the gas outlet the magazine has to be removed. — Turn the nozzle bolt by means of the cartridge case bottom. — Position “screw slot transverse to firing direction” gas outlet “minimum”. — Position “screw slot alongside firing direction” gas outlet “maximum”. Fig. 58: Screwed-on blank attachment (2?) Plastic training breach block — Lock the rifle. — Extract G3 magazine and breech block (note para 2.2.2.). — Insert plastic training breech block in the rifle. — Check proper assembly of the rifla by making several loading movements. — Load the rifle. — Fill the magazine with plastic training ammunition and insert magazine. — Unlock the rifle. — Set the selective fire lever at "E~ or “F* — Pull the trigger When the fire is interrupted or ceased, the weapon has to be locked. Note: Owing to dimensional differences it is impossible to fire NATO cartridges cal. 7.62 mmx 51 with the plastic training breech black. (3) Subcalibre conversion kit — Lock the rifle, — Extract G3 magazine and breech block (note para 2.2.2.), — Insert subcalibre tube E in the G3 barrel from behind. The bore on the face side has to point downwards, Check proper fit of the subcalibre tube E by inserting the magazine E. — Insert bolt E into the recelver. — Check proper assembly of the rifle by moving the loading lever several times. — Load tha rifle. — Fill magazine E with subcalibre ammunition and insert magazine, — Unlock the rifle. — Set the selective fire lever at “E" or “F". — Pull the trigger. When the fira is Interrupted or ceased, the weapon has to be locked. 2.1.3. Employment of the weapon with optical sighting devices 2.1.3.1. G3 telescopic sight with mount When using the Rifle G3 as sniper rifle the mount with telescopic sight Is placed as follawa: Fig. 59: Telescopic sight with mount — Prior to the mounting, turn the claws (58/1) of the mount outwards. — Place mount on the rifle from above, tilting the mount slightly to the right so that the plastic nose is adjacent to the sight cylindar., Note designations “firing direction” and "arrow". — Press tension laver (59/2) downwards until the catch ($9/3) engages audibly (Fig. 60). — Turn tension lever upwards. 41 Fig. 60: Placing of the telescopic sight with mount — To remove the telescopic sight with mount, turn tension lever downwards. — Press catch downwards with the thumb (Fig.