The M240, officially Machine Gun, 7.62mm, M240, is the US military designation for the FN MAG (Mitrailleuse d'Appui Général, meaning General Purpose Machine Gun), a family of belt-fed, gas-operated medium machine guns firing the 7.62×51mm NATO cartridge.
The M240 has been used by the United States Armed Forces since the late-1970s. It is used extensively by infantry, most often rifle companies; as well as ground vehicles; watercraft; and aircraft. Despite not being the lightest medium machine gun in service, it is highly regarded for reliability, and its standardization among NATO members is also seen as a major advantage.
All variants are fed from disintegrating belts, and are capable of firing most types of 7.62 mm (.308) NATO ammunition. M240 variants can use non-disintegrating belts (following replacement of a few easily swappable parts). There are significant differences in weight and some features among some versions which restrict interchangeability of parts. The M240s used by the US military are currently manufactured by FN Manufacturing, a US-based branch of FN Herstal.
The M240B and M240G (see Variants section) are usually fired from an integrated bipod, a vehicular mount, an M192 tripod that is mostly used by the U.S. Army; and the M122 tripod (a slightly updated M2 tripod) that is mostly used by the U.S. Marine Corps.
The M240G allows for commonality throughout the Marine Corps whether the weapon is used in an infantry, vehicular, or airborne role. The M240G is the ground version of the original M240 or M240E1, 7.62 mm medium class weapon designed as a
pintle mounted machine gun for
LAVs. The M240G can be modified for ground use by the installation of an "infantry modification kit" (a
flash suppressor, front sight, carrying handle for the
barrel, a buttstock, infantry length pistol grip,
bipod, and rear sight assembly). The M240G lacks a front heat guard, and as such is a few pounds lighter than the M240B, weighing in at 25.6 lb. The M240G has three gas settings, allowing this weapon to fire between 650 and 950 rounds per minute. On gas setting one the weapon will fire 650–750 rounds per minute, on gas setting two the weapon will fire 750–850 rounds per minute, and on gas setting three the weapon will fire 850–950 rounds per minute.
||M240B: 27.1 pounds (12.3 kg)
M240G: 25.6 pounds (11.6 kg)
M240L: 22.3 pounds (10.1 kg)
||49.7 in (1,263 mm)
||24.8 in (630 mm)
||4.7 in (118.7 mm)
||10.4 in (263 mm)
||Gas-operated, open bolt
|Rate of fire
||2,800 ft/s (853 m/s)
- Bipod: 800 m (880 yd)
- Tripod: 1,800 m (1,980 yd)
||4,074 yd (3,725 m)
||Non-disintegrating DM1 or disintegrating M13 linked belt
||Folding leaf sight with aperture and notch, front blade
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