How a HK UMP 45 SMG Works

Wikipedia:
Type Submachine gun
Place of origin Germany
Service history
In service 2000–present
Production history
Designed 1990s
Manufacturer Heckler & Koch
Produced 2000–present
Specifications
Mass Without magazine:

2.3 kilograms (5.2 lb) (UMP9/UMP40)
2.5 kilograms (5.4 lb) (UMP45)

With unloaded magazine:

2.5 kilograms (5.5 lb) (UMP9)
2.55 kilograms (5.6 lb) (UMP40)
2.65 kilograms (5.8 lb) (UMP45)

Length

450 mm (17.7 inches), stock folded
690 mm (27.2 inches), stock extended

Barrel length 200 mm (8 inches)
Cartridge

.45 ACP (UMP45/USC)
.40 S&W (UMP40)
9×19mm Parabellum (UMP9)

Action Blowback, closed bolt
Rate of fire 600 rounds/min
Muzzle velocity 285 m/s (935 ft/s) (.45 ACP)[2]
Effective firing range

100 m (9×19mm Parabellum)
65 m (.45 ACP)

Feed system

30-round detachable curved box magazine (UMP9)
30-round detachable straight box magazine (UMP40)
25-round detachable straight box magazine (UMP45)
10-round detachable straight box magazine (USC)