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The M240 was adopted by the U.S. Military Armed Forces following a world-wide competition in search for a reliable 7.62 mm NATO machine gun suitable for use as a coaxial weapon for armored vehicle applications. The Coaxial version of the famous Belgian MAG 58, produced by FN Herstal, won this competition and the M240 is now being produced by its U.S. subsidiary, FN Manufacturing LLC.
The reliability of this weapon, 26,000 Mean Rounds Between Failure (MRBF), makes it the world's most reliable machine gun. As a result of the outstanding performance of this weapon, other vehicle and infantry variants of the M240 are now in use by the U. S. Military.
U.S. M240B
NATO Equivalent - MAG 58
The M240B has been selected as the new medium machine gun for the U.S. Army and U.S. Navy ground use. The M240B is equipped with an integrated optical feed cover, hydraulic buffer, bipod, and a hand guard with heat shield to provide thermal protection to the operator.
U.S. M240G
The M240 G has been selected as the new medium machine gun for the U.S. Marine Corps. The M240G is equipped with an integrated optical feed cover, compression buffer, and a bipod.
U.S. M240N
The M240N has been selected as the new medium machine gun for the U.S. Navy. The M240N is equipped with an integrated optical feed cover, hydraulic buffer, but has no heat shield or bipod.
Interoperability
The U. S. produced M240 family retains all infantry related features and is produced to the same exacting specifications of the original MAG 58. consequently, all M240 variants have interchangeable components and are interoperable with foreign-produced NATO equivalent weapons. This has significant advantages in training, logistics support, and tactical versatility. For example, an M240B buttstock, bipod, and infantry trigger frame assembly may be carried in an armored vehicle to enable the tank crew to convert the coaxial weapon to an infantry model in the event that they are forced to withdraw from a disabled vehicle.
Common Characteristics
- Gas Operated
- Head-space and timing Fixed
- Mean round between failure 26,000
- Range: Maximum 3725 meters
- Tracer Burnout 900 meters
- Cyclic rate of fire (Operator Adjustable): Low rate 750 rpm: High Rate 950 rpm
- Muzzle Velocity 2800 ft/sec
- Slap ammunition compatibility Verified
Egress Kit
It enables the use of coaxial or pintle mounted M240 weapons as ground role machine guns for self-defense by dismounted crew members. It consists of the buttstock, trigger mechanism and bipod illustrated hereunder.
Accessories
- Flexible Gun Mount with Standard 200-round Ammo box
- Ring and Post Sight
- Bandoleer Hanger
- Adaptation Hardware for U.S. M122 Tripod
- Flexible Ammunition Chuting
- Buttstock and Bipod for Emergency Ground Use
- Ammunition boxes for 600 and 1200 round capacity
- Armorer's Tool Kit

| Specifications |
| Type: |
M240 B |
| Caliber: |
7.62mm NATO |
| Max. Effective Range: |
n/a |
| Max. Range: |
3725 meters |
| Muzzle Velocity: |
2800 fps |
| Cyclic Rate: |
750-950 rounds per minute |
| Weight: |
n/a |
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