Uncompromising support

The best technology
Heckler & Koch for Military & Law Enforcement

Calibre 40 mm x 53 HV

Ammunition box 32 rounds

Maximum effective range up to 1500 metres

Support weapon with large area of effect

Ammunition variety for concentrated firepower

The GMG fires belt-linked grenades in 40 mm x 53 calibre with an effective range of up to 1500 metres. Shooting individual rounds is also possible with the GMG. Suitable ammunition types range from fragmentation explosive rounds, battlefield illumination rounds, smoke ammunition for suppressing enemy reconnaissance, flash/bang practice ammunition up to shaped charge warheads used against hardened point and area targets. Using a fire-control system adaptable to the GMG, infrared-programmed airburst rounds can acquire targets behind cover.

GMG - Uncompromising support
Vehicle and object protection

In the role of an active self-protection system, the 40 mm high-velocity grenade machine gun is integrated into remote-controlled weapon stations. Under vehicle protection on battle tanks or lightly protected patrol vehicles, target acquisition and engagement is carried out fully electronically from the vehicle cabin by means of operating software. The GMG is also integrated into stand-alone weapon stations, which are predominantly used for object protection.

In use by the Bundeswehr
Technical specifications
Precision at a glance.
40 x 53 mm
Operating principle
Direct gas-operated weapon
Bolt system
Blowback, firing from an open bolt
Feed mechanism
Belt feed from left or right
Cartridge case ejection
Modes of fire
Single fire / sustained fire
Trigger pull
120 N
Rate of fire
340 rounds/minute
Muzzle velocity
240 m/s
Barrel profile/Twist
Groove/land profile, 24 grooves, right-hand twist
Mech. ladder sight / reflex sight
Max. effective Range
1500 m

Values rounded. Dimensions and weights may vary depending on the configuration. Subject to technical changes.


For any mission requirement. The variants of the GMG product family.

Made for Safety

We want people to be able to live safely. Our products are designed to protect people in free democratic countries from threats and violence. Heckler & Koch is the leading manufacturer of small arms for NATO and EU countries.