The overall length is 41” but it becomes 31.5″ when the buttstock is detached from the frame. The only difference is the quality of the finish, the parts which are fitted to the receiver, and the engraving. Please note that the M1921, M1928, and M1928A1 all use an identical receiver. The Thompson T1B model comes with a detachable buttstock with vertical foregrip. Philadelphia Ordnance is the standard of excellence for 80 machined receivers for the M1921, M1928, M1928A1, M1 and M1A1. 45 ACP caliber Thompson 1927-A1 has a pinned Cutts compensator, which lengthens the finned barrel length to 18”, and puts the overall length for the carbine at 41” from buttstock to muzzle. For more than 100 years, the “Chicago Typewriter”, the time-honored submachine gun, has been a favorite among collectors and shooting enthusiasts.
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