4/3/2023 0 Comments Thompson 1928a1 serial numbers![]() ![]() 45 pistol cartridge, in a relatively small and “light” ( ten-pounds empty) selective fire weapon that he called a “trench-broom.” The use of the Blish lock was then determined by General Thompson to be adequate with the much smaller and less powerful M1911. Thompson with an early working Thompson machine gun Blish had noticed had worked with naval cannon, but miniaturizing it for the use with a rifle was apparently unworkable, as it did not function well with the high-pressures and bolt velocities of our. This was a friction lock meant to delay the opening of a bolt when pressures had dropped to a safe level. He became acquainted with a retired USN commander named John Blish, and was attempting to develop a rifle caliber weapon using the so-called “ Blish Lock.” However, Thompson’s primary focus was in the development of auto-loading small arms. ![]()
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