Cartridge: 5.56 x 45 mm NATO
Origin: United States
Type: Selective-fire rifle
Manufacturer: Sturm, Ruger & Co.
Weight: 6 lb 6 oz lb (2.90 kg)
Length: 37.25 in (946 mm)
Barrel length: 13 in (330 mm) to 22.0 in (559 mm)
Action: Gas-operated, rotating bolt
Muzzle velocity: 3,240 ft/s (990 m/s)
Feed system: 5- to 30-round box magazine
Cartridge: .45 ACP
Origin: United States
Designer: John T. Thompson
Manufacturer: Auto-Ordnance Company (originally)
Birmingham Small Arms, Colt, Savage Arms
Weight: 4.9 kg empty (M1928A1), 6 kg (with ammo)
(M1928A1), 4.8 kg empty (M1A1)
Length: 33.5 in (851 mm) (M1928A1)
32 in (813 mm) (M1A1/M1)
Barrel length: 10.5 in (267 mm) 12 in (305 mm) (with cutts compensator)
Cartridge: .45 ACP
Barrels: 1
Action: Blowback, Blish Lock
Muzzle velocity: 280 m/s (919 ft/s)
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)