| Type | Submachine gun |
|---|
| Place of origin |  United States |
| Service history |
| In service | 1938–1971 (officially, U.S. military) |
| Used by | See Users |
| Wars | - World War II
- Korean War
- Vietnam War
|
| Production history |
| Designer | John T. Thompson |
| Designed | 1917–1920 |
| Manufacturer | Auto-Ordnance Company (originally)
Birmingham Small Arms
Colt
Savage Arms |
| Produced | 1921–present |
| Number built | 1,700,000 approx. |
| Variants | Persuader & Annihilator prototypes,
M1921, M1921AC, M1921A,
M1927, M1928, M1928A1,
M1, M1A1 |
| Specifications |
| Weight | 10.8 lb (4.9 kg) empty (M1928A1)
10.6 lb (4.8 kg) empty (M1A1) |
| Length | 33.5 in (851 mm) (M1928A1)
32 in (813 mm) (M1A1/M1)
barrel 10.5 in (267 mm)
barrel with optional Cutts Compensator 12 in (305 mm) |
|
| Cartridge | .45 ACP (11.43 × 23 mm) |
| Action | Blowback, Blish Lock |
| Rate of fire | 600–1200 rpm, depending upon model |
| Muzzle velocity | 285 m/s (935 ft/s) |
| Effective range | 50 metres (160 ft) |
| Feed system | 20-round stick/box magazine
30-round stick/box magazine
50-round drum magazine
100-round drum magazine
(M1 and M1A1 models do not accept drum magazines) |
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