How a Heckler & Koch MP7 Works

Wikipedia:
Type: Personal defense weapon / Submachine gun
Place of origin Germany
Service history
In service 2001–present
Used by 20+ countries
Wars
War in Afghanistan
Iraq War
Operation Inherent Resolve
Operation Neptune Spear
Papua Conflict

Production history
Manufacturer Heckler & Koch
Produced 1999–present
Specifications
Mass

1.90 kg (4.2 lb) with 20-round empty magazine (PDW)
2.10 kg (4.63 lb) with magazine (MP7A1)[2]

Length 638 mm (25.1 in) stock extended / 415 mm (16.3 in) stock collapsed
Barrel length 180 mm (7.1 in)
Width 51 mm (2.0 in)
Height 169.5 mm (6.7 in)
Cartridge HK 4.6×30mm
Action Gas-operated, short stroke piston, rotating bolt
Rate of fire 950 rounds/min
Muzzle velocity 735 m/s (2,411 ft/s) (Fiocchi CPS Black Tip ammunition)
Effective firing range 200 m (660 ft)
Feed system 20-, 30- or 40-round detachable box magazine
Sights Tritium-illuminated flip-up night sights; handgun and rifle sights (adjustable)