.300 Blackout AR Pistol
The cartridge built so a short barrel would stop being a compromise, worked through from the numbers: velocity against barrel length measured rather than assumed, why supersonic and subsonic are really two cartridges sharing a case, the brace-and-SBR law tracked to the agency’s own filings, and the chambering mistake that destroys the rifle.
.300 Blackout AR Pistol · Deep Dive
A longer barrel is a liability here — 200-grain subsonic clocked 1,139 fps from 16.5 inches, which is supersonic, the one thing it must not be.
The cartridge built so a short barrel would stop being a compromise, worked through from the numbers: velocity against barrel length measured rather than assumed, why supersonic and subsonic are really two cartridges sharing a case, the brace-and-SBR law tracked to the agency’s own filings, and the chambering mistake that destroys the rifle.
Photo: Three cartridges, .300 AAC Blackout by Silencertalk · CC BY-SA 3.0
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