M129 grenade launcher
Type Automatic grenade launcher
Place of origin United States
Service history
Used by United States
Wars Vietnam War
Production history
Designer Philco-Ford [1]
Designed 1966 [1]
Number built over 1667[2]
Length 597 mm
Barrel length 419 mm

Cartridge 40x53mm grenade, 40x46mm grenade
Caliber 40 mm
Action Automatic, motor driven [1]
Rate of fire 400 rpm [2]
Muzzle velocity 850 feet per second (Bad rounding hereScript error m/s) [1]
Effective range 2,045 yards (Bad rounding hereScript error m) [1]
Feed system belt

The M129 is a 40mm automatic grenade launcher that was used as an aircraft weapon in United States service. It was developed from the earlier M75 and was capable of using both the high-velocity 40x53mm grenade and the lower velocity 40x46mm grenade.[1]



M129 as part of the XM94 system

The M129 was a redesign of the M75 grenade launcher that featured reduced recoil and improved mounting and provided an increased rate of fire of up to 400 rpm compared to 225 rpm for the M75. The M129 was used with the chin-mounted M28 series armament subsystem used on the AH-1G, MOD AH-1S, and production AH-1S Cobra. The M129 was also used on the:


XM28 Schmatic

Schéma de la tourelle XM28 d'un AH-1 Cobra; la gatling est couplé à un lance-grenade M129.

The M129 was effectively a redesign of the older M75 to incorporate a concentric cam and improved mount.[3] The major problem with the M75 was the torque created due to the barrel being below the operating drum. In the M129 the barrel is concentric with the drum and the excessive torque is thus eliminated. Otherwise, operation of the weapon is extremely similar to that of the M75, with the reciprocating barrel and cam assembly still presenting itself, the weapon still being electrically driven and ammunition still fed trough a belt system. Some other improvements were made to the M129, most notably that of the addition of special feed tray to permit the firing of low-velocity and high-velocity ammunition, a mechanism to provide instant interchange between electric operation and manual hand-crank operation and a dynamic braking unit to guarantee that the launcher barrel always stopped in the forward (safe) position when the firing trigger is released.


  1. 1.0 1.1 1.2 1.3 1.4 1.5 Script error
  2. 2.0 2.1 Script error
  3. US Army TACOM-RI. 5 October 2005 U.S. ARMY HELICOPTER WEAPONS. Access Date: 25 January 2008

See alsoEdit

External linksEdit

pl:Granatnik M129