That was David “Carbine” Williams who invented a floating chamber/short stroke piston which was incorporated into the design of the M-1 carbine.
Williams’ floating chamber was also used in the Colt Conversion Unit, it replaced the slide/barrel, etc., of the M1911A1 pistol and when installed, the user could fire .22LR cartridges with the approximate recoil effect of the .45ACP cartridge. I bought one new in 1975 through the gun shop I worked at for the princely sum of $69 + tax...