This guide details the operation of the Thompson Model of 1921, focusing on its unique selector switches and the 50-round drum magazine. Expert Ian McCollum demonstrates the manual winding process for the drum, which uses a clock-style spring requiring 11 clicks for the 1921 model. The video also highlights the dual selector switches for safe/fire and semi-auto/full-auto modes, offering a glimpse into the internal firing cycle.
The Thompson 1921, also known as the 'Chicago Typewriter,' was the first production submachine gun from Auto-Ordnance. Despite its innovative design, including the flawed Blish Principle, its high price point limited early sales primarily to law enforcement and banks. The Model 1921AC featured a Cutts Compensator and offered various magazine options, though the 100-round drum was cumbersome.
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