Colt 1921 Thompson .45 ACP, Transferable Machine Gun, All Original

Description

In 1938, the Thompson submachine gun was adopted by the U.S. military, serving during World War II and beyond.

There were two military types of Thompson SMG.

The M1928A1 had provisions for box and drum magazines. It had a Cutts compensator, cooling fins on the barrel, employed a delayed blowback action and its charging handle was on the top of the receiver.
The M1 and M1A1 had a barrel without cooling fins, a simplified rear sight, provisions only for box magazines, employed a straight blowback action and the charging handle was on the side of the receiver.
Over 1.5 million military Thompson submachine guns were produced during World War II.Mass
10.8 lb (4.9 kg) empty (Thompson M1928A1)
10 lb (4.5 kg) empty (Thompson M1A1)

Length
33.7 in (860 mm) (M1928A1 with compensator)
31.9 in (810 mm) (M1/M1A1)
Barrel length
10.52 in (267 mm)
12 in (300 mm) (with Cutts compensator)

Cartridge
.45 ACP (11.43×23mm)
10mm Auto (Limited quantity of FBI conversions)

Action Blowback, Blish Lock

Rate of fire
approx. 700–800rpm (M1928),
approx. 600-700rpm (M1A1),
approx.900 rpm (M1921)
approx. 1500 rpm (Annihilator)

Muzzle velocity 935 ft/s (285 m/s)

Effective firing range 164 yds (150 m)

Feed system
20-round stick/box magazine 0.4 lb (0.2 kg) unloaded
30-round stick/box magazine 0.5 lb (0.2 kg) unloaded
50-round drum magazine 2.6 lb (1.2 kg) unloaded
100-round drum magazine
(M1 and M1A1 models do not accept drum magazines)