Submachine Gun, Cal. .45, M1928A1, Thompson
Submachine Gun, Cal. .45, M1/M1A1 Thompson
The M1928A1 "Tommy Gun", a delayed blowback
submachine gun, was issued to armored and reconnaissance units.
It was selective for semi- or fully-automatic fire. It fired a
.45 cal. cartridge in 20- or 30-round magazines, or a 50-round
drum. It had a leaf with aperture notch battle sight. It's rate
of fire was 600-725 spm. The M1928A1 had a removable buttstock.
Most had a horizontal fore grip, but some had a vertical fore
grip. The M1928A1 was relatively heavy, and expensive in use of
materials, machine time, and machine tools.
Submachine Gun, Cal. .45, M1/M1A1
Thompson was a blowback submachine gun.
It was selective for semi- or fully-automatic fire. It
fired a .45 cal. cartridge in 20- or 30-round magazines.
It's rate of fire was 700 spm. The gun was reliable, and
continued to operate when similar weapons would have failed
due to exposure to battle-field conditions (354,000).
- M1 Thompson was a redesign of the model M1928A1
to simplify production. The M1 had a permanently attached
buttstock and a spring-loaded firing pin like the M1928A1.
The M1 would not accept the M1928A1 drum type magazine.
The M1 had a simple fixed aperture rear sight.
- M1A1 differed from the M1 only in having the firing
pin machined into the face of the bolt.
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