The Patchett Machine Carbine Mk I, predecessor to the Sterling SMG, was designed by George William Patchett to improve upon existing models like the Sten and Lanchester. It met most 1944 British War Office requirements for a 9mm machine carbine, though its rate of fire was around 600 rpm. Key differences from the later Sterling include a 90-degree magazine well for Sten/Lanchester magazines, aluminum grips, and a distinct folding stock mechanism. Despite successful trials, it wasn't adopted until refined into the Sterling SMG.
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