More weapon information:
Weapon name:
Thompson M1A1

Length: 813 mm (32 in)
Weight: 4.8 kg (10.6 lb)

Caliber:
.45 ACP

Action:
Blowback

Rate of fire:
700-1000 rounds/min

Muzzle velocity:
 280 m/s (920 ft/s)

Effective range:
200 m (656 ft)

Feed system:
20-round detachable box magazine,
30-round detachable box magazine,
drum models have 50-round drum or 100-round drum

Sights:
Fixed rear peep sight and blade foresight