45 ACP cartridge. Thompson’s Trench Broom hit a number of snags in development, as neither a gas-operated process nor a straight blowback proved well suited for what he envisioned. What he required was a retarded blowback program. The limited-stroke piston to the underside in the M1 Carbine’s barrel. Tyler Freel https://antonioy566sgs4.corpfinwiki.com/user