Sourcing the Missing Parts — Who Sells What, What Fits What, the Magazines, and Whether the Kit Pays

8.1 How Prices Are Given Here

Every price in this volume was read on the seller’s own web page on 19 September 2026, and is given as displayed, not as confirmed at checkout. A price that could not be tied to a specific item on its page is not given. Prices from archived pages carry their capture date. Search-engine summaries of prices were not used; the hub has been caught by them before.

Several large retailers — Brownells, Palmetto State Armory and others — refused automated reading of their pages on that date, and their prices are absent for that reason, not because they do not sell AUG parts. A builder should check them.

8.2 What a Kit Lacks, and What It Must Lose

The kits on the US market in September 2026 describe themselves (Vol 6 §6.4). From those descriptions, the list of parts a builder must find divides into three.

Missing from the kit:

Table 1 — Missing from the kit:

Part	Why missing	Where it comes from
Receiver	it is the firearm; the military receiver was destroyed or never exported	§8.4 (one dealer listing); Vol 6 §6.5
Barrel, with its gas cylinder, piston and regulator	Apex’s and Max Arms’ kits exclude “the receiver and barrel assembly” and “Barrel, receiver, or receiver parts”	§§8.3–8.4
Magazine	sold separately or not included	§8.6
Optic (A1 pattern)	on the A1 it is part of the receiver (Vol 10 §10.8)	§8.3; or a rail

In the kit, but not usable in a semi-automatic rifle:

Table 2 — In the kit, but not usable in a semi-automatic rifle:

Part	Why	Replacement
Trigger mechanism (hammer pack)	select-fire; Apex: “can be switched between full auto and 3 round burst”	a semi-automatic pack, §8.3
Stock	the military stock; Steyr and PJ’s sell distinct semi-automatic stocks (Vol 6 §6.6)	§8.3
Bolt carrier, if military pattern	Steyr and PJ’s list a distinct semi-automatic carrier (Vol 6 §6.6)	§8.4

In the kit and usually usable, once identified (Vol 7 §7.2): the bolt (if seven-lug), butt plate, flash hider, cocking handle, sling swivels, cleaning kit and small parts.

8.3 Steyr Arms USA

The maker’s American company sells parts through its own store at steyr-arms.us. (The older steyrarms.com address now carries a parked page, and steyr-arms.com/us/ refused access on 19 September 2026.) Its product data, including its own part numbers, gave these listings:¹

Table 3 — 8.3 Steyr Arms USA

Item (Steyr’s wording)	Steyr SKU	Price, 2026-09-19	Stock
AUG Trigger Packs (standard or NATO)	1250030530 (standard)	$136.00	in stock
AUG A3 NATO Trigger Pack	1250030512	$136.00	out
AUG Enhanced Trigger Spring Kit	1251030600	$56.00	in stock
AUG Stocks (standard or NATO; green, mud, white, black)	—	$360.00	in stock
AUG A3 NATO stock (with bolt release)	—	$360.00	out
NATO Stock Conversion Bundle	—	$452.80 (sale; $566.00 regular)	out
AUG 9mm Stock	1753060600	$375.00	in stock
AUG Butt Plate Black	1200060450	$45.00	in stock
AUG Stock Retaining Pin	1200030460	$25.00	in stock
AUG Bolts, right or left hand (“complete”)	120004057	$330.00	in stock
AUG Kits — Spare Parts Kit (“high wear components”)	1200000600	$249.00	in stock
STG77/AUG Barrel 20″ 1:9	STG1255010660	$449.00	in stock
AUG Barrel 14.5″ / 16″ 1:9 — Closeout	12550106-C (14.5″)	$349.00 each	in stock
AUG Barrel 16″ / 20″ HBAR 1:7	—	$399.00 each	in stock
AUG Barrel 14.5″ 1:7	—	$399.00	out
24″ HBAR with Bipod 1:7	—	$699.00	in stock
AUG Barrel 300 AAC Blackout 16″ 1:8	—	$399.00	in stock
AUG 9x19mm Police Training Kit, 1:10	—	$799.00	in stock
Gas Regulator for Suppressed Firing	—	$109.00	out
AUG Optics — A3SF 60MM	1252020528	$899.00	in stock
AUG A3 M1 Short Picatinny Rail (“M1 models only”)	1252020042	$125.00	in stock
AUG Waffle Magazine, 30 rounds (black or green)	1200050502 (black)	$29.00	in stock
AUG Waffle Magazine, 42 rounds	1200050510	$49.00	in stock
AUG Waffle Magazine, 10 rounds	1245050510	$49.00	in stock

Three things the store does not sell. No receiver. No bolt carrier — a search of the store for “carrier” returned only a magazine pouch. And no standard gas regulator as a separate item. The factory 1.5× and 3× optic housings were still named as options but could not be bought.¹

One thing the store does not say. No listing states where the part was made. For a builder counting on a Steyr trigger pack or stock as a US-made part under §922(r), that is the question to put to the company in writing (§8.9).

Steyr also advises: “It is recommended that all Steyr Arms parts be installed by a qualified and trained gunsmith.”¹

8.4 Specialist Dealers

Table 4 — 8.4 Specialist Dealers

Dealer	What its own page listed	Prices, 2026-09-19
PJ’s Steyr AUG parts (pjs-steyraug.com; page “Updated: December 8, 2025”)	“AUG A1/A2/A3/M1/USR RECEIVER GROUP” (A3/M1 long rail, “2 In Stock”); “Complete Rifle Parts Kits Minus Receiver,” new A3/M1 parts; semi-automatic and full-automatic carrier groups, hammer packs and stocks listed separately, full-automatic packs labelled “NFA”; US-made and Austrian barrels	receiver group $1,250 shipped; A3/M1 parts kit minus receiver $1,250; semi-automatic roller bolt carrier group $650; A1/A2/USR semi-automatic hammer packs $130
RTG Parts (robertrtg.com)	magazines, a 9 mm conversion kit, a StG 77 1.5× optic, an A3 M1 short rail, slings, a cleaning kit; no receiver or kit	9 mm kit $899.00; StG 77 1.5× optic $759.00; A3 M1 short rail $124.99
Apex Gun Parts (apexgunparts.com)	Austrian and Malaysian surplus kits (Vol 6 §6.4); a “Steyr AUG Eclipse Flash Hider, .30 Cal., US Made 922(r) Compliance Part”	Austrian kit “As low as $399.95,” out of stock; flash hider $49.95
Max Arms (max-arms.com)	“AUG A1 Key Parts Kit”	$299.92 / $382.92
Magpul (magpul.com)	“PMAG 30 AUS GEN M3 Window – Steyr AUG,” MAG575	$29.95, in stock
Corvus Defensio (Austria; corvusdefensio.com)	AUG rails, a locking-piece set, an ejector-and-extractor set, a firing pin, an A2/USR receiver rail	locking-piece set €59.00; ejector/extractor set €119.00; firing pin €59.00; A2/USR rail €228.00

Sources are in the footnotes.²³⁴⁵⁶⁷ PJ’s receiver group is the only receiver found for sale; who made it and how it is transferred were not stated (Vol 6 §6.5). Numrich, Tapco, Samson, TDI, Arbitrary Tactical and Rainier were not checked. Midwest Industries’ and TriggerTech’s own site searches returned no AUG product; Geissele’s site refused automated reading.

8.5 What the Makers Say Fits What

Interchange claims about the AUG are mostly forum lore. The statements below are the makers’ own, and they are the only ones this dive relies on.

Table 5 — 8.5 What the Makers Say Fits What

Pair	The maker’s statement	Source
StG 77-pattern barrel → any 1:9 AUG	”Fits all AUG models with 1:9 twist, 3-prong flash hider”	Steyr Arms USA, STG77/AUG barrel
Steyr bolt → 5.56 and .300 BLK AUGs	”will fit Steyr AUG .223 Rem, 5.56x45mm and .300 Blackout”	Steyr Arms USA, AUG Bolts
Standard pack ↔ NATO stock	separate standard and NATO packs are sold	Steyr Arms USA
A3 NATO pack → original A2 NATO stock	”THIS TRIGGER PACK WILL NOT WORK WITH ORIGINAL A2 NATO STOCKS”	Steyr Arms USA
A3 NATO stock → pack	”Requires A3 NATO trigger pack (part number 1250030512) to engage bolt release!”	Steyr Arms USA
A1/A2/USR semi pack → A3	”Not for use on the new AUG/A3 models with last round hold open”	Steyr Arms USA archived store, 2017
A3 M1 optic housing → A3 SA	”will not fit the A3 SA”	Steyr Arms USA, A3SF
A3 M1 factory 1.5× optic	”integrates onto the A3 M1 receiver ONLY”	Steyr Arms USA archived store, 2019
Butt plate	”Fits all AUG variants”	Steyr Arms USA
Steyr magazines → MSAR STG-556	”The STG-556 accepts STG-556 magazines and most of AUG magazines”	MSAR manual
MSAR STG-556 ↔ STG-E4 magazines	”STG-E4 XM30 magazines will not work in the STG-556”; “STG-556 Magazines will not work in the STG-E4”	MSAR manual
Six-lug European civilian bolt → military barrel	the civilian barrel and bolt “are not compatible with military ones”	Austrian Parliament, 2005
Bolt ↔ carrier	”Do not interchange slides and bolt locks. Keep a slide with its original bolt carrier.”	Steyr maintenance manual

Sources: Steyr Arms USA store and archived pages;¹⁸ MSAR manual;⁹ Austrian Parliament answer;¹⁰ Steyr maintenance manual.¹¹

What no maker says: that Steyr and MSAR barrels, bolts or packs interchange; that Lithgow (F88) parts interchange with Steyr’s, beyond the magazine; that Malaysian SME parts interchange with Austrian ones, though licence production implies it. Each of those is a question to be settled by fitting, not assumed.

8.6 Magazines

The AUG has two magazine families, and the stock decides which a rifle takes (Vol 4 §4.6).

Steyr-pattern. Steyr describes them as “Detachable, synthetic (transparent) staggered box type,” in 9 (European civilian), 10, 30 and 42 rounds; Steyr Arms USA calls them “Waffle” magazines.¹² The options on 19 September 2026:

Table 6 — Steyr-pattern. Steyr describes them as "Detachable, synthetic (transparent) staggered box type," in 9 (European civilian), 10, 30 and 42 rounds; Steyr Arms USA calls them "Waffle" magazines.[^steyrus] The options on 19 September 2026

Magazine	Seller	Price	Note
Steyr AUG Waffle, 30 rounds	Steyr Arms USA	$29.00	origin not stated
Steyr AUG Waffle, 42 rounds	Steyr Arms USA	$49.00	origin not stated
Steyr AUG Waffle, 10 rounds	Steyr Arms USA	$49.00	origin not stated
Magpul PMAG 30 AUS GEN M3 Window, MAG575	Magpul	$29.95	”Mil-issue Steyr AUG, F88 Austeyr, and F90”; not the NATO conversion
Steyr .300 BLK standard, 30 rounds	Steyr Arms USA	$29.99	for the Steyr-magazine stock

Magpul’s page is also the primary evidence that the Australian F88 and F90 take the Steyr-pattern magazine.⁶ Surplus Steyr magazines often come with or alongside kits — Apex sells one per kit — and are imported.⁴

NATO. The NATO stock takes STANAG (AR-15-pattern) magazines. Steyr Arms USA resells a Magpul .300 Blackout PMAG for the NATO AUG at $24.00.¹

MSAR magazines. The STG-556’s square-pattern amber magazines fit the STG-556 and are “for use with STG-556 only!” by MSAR’s 2012 price list; the E4 used AR-pattern magazines.¹³ An MSAR STG-556 magazine may fit a Steyr stock — MSAR says its rifle takes “most” AUG magazines, which is the other direction — but that was not confirmed.

The 9 mm AUG uses its own magazines and its own stock (Vol 4 §4.9).

8.7 Parts for the §922(r) Count

Vol 6 §6.8 sets out the count. The parts that can be bought as US-made, from the pages read:

• A US-made magazine removes three imported parts while it is in the rifle. Magpul’s MAG575 at $29.95 is the obvious one; its country of manufacture should be read on the magazine itself.
• A US-made flash hider removes one. Apex’s “US Made 922(r) Compliance Part” at $49.95 is described as “.30 Cal.” — a bore larger than 5.56 — and a builder should weigh that before fitting it to a 5.56 barrel.
• A US-made barrel removes one, and arguably two with its extension. PJ’s lists “U.S. Made (Cold Hammer Forged)” AUG barrels.
• A US-made receiver is one, and is part of any build.
• A trigger pack and stock would remove up to four or five, if they are US-made. Steyr Arms USA does not say.

8.8 Does the Kit Pay?

A kit is a way to own an AUG. Whether it is a cheaper way depends entirely on what the kit contains and what the receiver costs, and the numbers can be laid out.

A factory rifle. Sportsman’s Warehouse listed the Steyr Arms AUG A3 M2 in 5.56 with a 16-inch barrel at $1,899.99 (green, out of stock), and Impact Guns’ Steyr listing page showed 16-inch 5.56 M2s at about $1,880 (in stock), on 19 September 2026.¹⁴¹⁵ Steyr Arms USA’s own store listed the A3 M1 at $2,195.00 in 2019 (Vol 3).

A kit, completed from the maker and a dealer. For a kit of the kind on sale — no receiver, no barrel, a select-fire pack and stock — the least a builder buys, on the prices above:

Table 7 — A kit, completed from the maker and a dealer. For a kit of the kind on sale — no receiver, no barrel, a select-fire pack and stock — the least a builder buys, on the prices above

Item	Price, 2026-09-19
Kit (Apex, Austrian)	$399.95
Receiver group (PJ’s)	$1,250.00
Barrel, 16 in 1:9 (Steyr, closeout)	$349.00
Semi-automatic trigger pack (Steyr)	$136.00
Semi-automatic stock (Steyr)	$360.00
US magazine (Magpul)	$29.95
Total	$2,524.90

That is before a semi-automatic carrier if the kit’s is military ($650 at PJ’s), headspace gauges, a transfer fee and tax, and an optic. It is about $650 more than a new factory rifle.

The arithmetic turns on two items. If a receiver can be found for much less than $1,250, or the kit already supplies a usable barrel, the gap narrows; if the kit’s carrier or optic also needs replacing, it widens. On September 2026 prices, an AUG import kit is not a cheap way to an AUG. It is a way to build one, from the rifle’s original military parts, and the reason to do it is the build.

8.9 Questions to Put to the Suppliers

Every one of these was left open by the suppliers’ own pages, and each is best asked in writing so that the answer can go in the rifle’s file (Vol 7 §7.11).

1. Steyr Arms USA ([email protected]): where are its trigger packs, stocks, bolts, barrels and magazines made? Will it sell a receiver to an individual through a dealer? Does its standard trigger pack fit an A1-pattern stock without the external release lever?
2. PJ’s: who made the receiver group; is it new; is it US-made or import-marked; how is it transferred?
3. The kit’s vendor: the kit’s origin and generation; whether the carrier is the semi-automatic or military pattern; and whether the importer holds an ATF classification covering the select-fire pack.

8.10 What Could Not Be Confirmed

• Where Steyr Arms USA’s parts are made.
• A second source of receivers, and the maker of the one found.
• Interchange between Steyr and MSAR, Lithgow or SME parts beyond the makers’ statements above.
• Prices at the large retailers whose pages refused automated reading.
• The country of manufacture of Magpul’s MAG575 as marked on the magazine.
• The muzzle thread of US-made AUG barrels. Steyr’s European manual gives M13×1 left-hand for its own.

Sources

Footnotes

1. Steyr Arms, Inc., online store, https://steyr-arms.us/shop/category/tactical/aug/ and the store’s product data (WooCommerce Store API), read 2026-09-19. ↩ ↩² ↩³ ↩⁴ ↩⁵

2. PJ’s Steyr AUG parts, “Factory Steyr AUG/USR Parts,” http://www.pjs-steyraug.com/augusrparts.html, page marked “Updated: December 8, 2025,” read 2026-09-19. ↩

3. RTG Parts, “Steyr AUG,” https://www.robertrtg.com/steyr-aug, read 2026-09-19. ↩

4. Apex Gun Parts, “Steyr AUG Parts Kit, w/ Sling & Cleaning Kit, Austrian, 5.56x45 NATO,” SKU STYRKT-BNDL-A, https://www.apexgunparts.com/steyr-aug-kit-vg.html, read 2026-09-19, including its related-product listing of the “Steyr AUG Eclipse Flash Hider, .30 Cal., US Made 922(r) Compliance Part.” ↩ ↩²

5. Max Arms, “AUG A1 Key Parts Kit – 5.56x45mm NATO,” https://max-arms.com/product/sme-steyr-aug-key-parts/, read 2026-09-19. ↩

6. Magpul Industries, “PMAG 30 AUS GEN M3 Window – Steyr AUG,” MAG575, https://magpul.com/pmag30ausgenm3window-5-56x45-steyraug-commercial.html, read 2026-09-19. ↩ ↩²

7. Corvus Defensio, shop search “aug,” https://corvusdefensio.com/?s=aug&post_type=product, read 2026-09-19. Prices in euros as displayed. ↩

8. Steyr Arms, Inc., archived store pages: “AUG SA Hammer Pack,” Wayback Machine capture of 6 June 2017; “STEYR FACTORY 1.5 X OPTIC FOR AUG A3 M1,” capture of 14 October 2019; “AUG A3 M1 Optic A3SF 60mm (will not fit the A3 SA),” capture of 7 July 2023; all retrieved 2026-09-19. ↩

9. Microtech Small Arms Research, STG-556 Operator’s Manual, Wayback Machine capture of 14 July 2011, retrieved 2026-09-19. ↩

10. Republik Österreich, Parlament, Anfragebeantwortung 3599/AB, XXII. GP, https://www.parlament.gv.at/PAKT/VHG/XXII/AB/AB_03599/fnameorig_056189.html, accessed 2026-09-19. ↩

11. Steyr Mannlicher AG, Maintenance Manual, Army Universal Assault Rifle, Steyr AUG, undated, Chapter IV §4.2. Internet Archive, retrieved 2026-09-19. ↩

12. Steyr Arms, Inc., “AUG,” https://steyr-arms.us/firearms/tactical-rifles/aug/, read 2026-09-19; Steyr Arms GmbH, “AUG A1,” https://www.steyr-arms.com/en/military-law-enforcement/assault-rifles/aug-a1/, accessed 2026-09-19. ↩

13. Microtech Small Arms Research, 2012 MSRP price list, Wayback Machine capture, retrieved 2026-09-19. ↩

14. Sportsman’s Warehouse, “Steyr Arms Standard AUG A3 M2 5.56mm NATO 16in OD Green,” https://www.sportsmans.com/shooting-gear-gun-supplies/modern-sporting-rifles/steyr-arms-standard-aug-a3-m2-5.56mm-nato-16in-od-green-semi-automatic-modern-sporting-rifle-301-rounds/p/1941840, read 2026-09-19 ($1,899.99, out of stock). ↩

15. Impact Guns, “Steyr” listing page, https://www.impactguns.com/steyr/, read 2026-09-19. The page’s product titles were garbled in extraction; the figure is given as approximate for that reason. ↩