It was developed in-house by General Dynamics based on the experiences of US forces in Afghanistan around 2010, who were finding their M240s had issues countering insurgent forces using PKMs, particularly when ambushed from high ground at extreme range where the 7.62mm NATO round drifts noticeably more than the 7.62x54mmR. Because of this technology, it has similar felt recoil to the M240 Machine Gun despite being the same weight as the M240L and almost six pounds lighter than the M240B while firing a much more powerful round. It seems General Dynamics has finally solved the rate-of-fire issues that plagued past iterations of this technology, and while the rate of fire is still at the low end of the scale for a machine gun, it is almost doubled from the XM806 and similar to that of a Browning M2. In both systems a large part of the gun's mechanism including the barrel and gas system (save on the recoil-operated XM806) reciprocates during firing and shots are timed to occur when the group is moving forward, forcing recoil to first overcome the momentum of the forward-moving component group. It is mechanically based on a patented system called "short recoil impulse averaging," a recoil-mitigating technology derived from the "differential firing" mechanism developed for the cancelled XM806 and XM307 & XM312.
The General Dynamics Lightweight Medium Machine Gun (LWMMG) is a prototype gas-operated open-bolt general-purpose machine gun (since that is what a "lightweight medium machine gun" is) chambered in. The weapon is ideally suited for both mounted and dismounted operations: the increase in effective range and lethality in a lightweight form is substantial for dismounted operations.Lightweight Medium Machine Gun prototype with Trijicon TA648MGO-M2 6x48 ACOG scope. Operational Value: The Lightweight Medium Machine Gun is a weapon system that greatly expands the operational capabilities of the warfighter. The light weight and low recoil of the weapon affords operators of all sizes the ability to carry and deliver lethal effects. The patented technology of the Short Recoil Impulse Averaging substantially reduces recoil and improves target retention during automatic fire. The LWMMG adapts to currently fielded tripods and standard vehicle mounts. The weapon’s simple assembly quickly breaks down into six functional groups, and all field maintenance is performed without the need for special tools. The LWMMG features a quick change barrel with fixed headspace and timing as well as integrated MIL-STD-1913 rails, allowing the use of a variety of optics, lasers and accessories. Weighing less than 24 pounds and featuring a fully collapsible stock, the LWMMG offers superior mobility and portability in both mounted and dismounted operations.
At 1,000 meters, the LWMMG is capable of defeating Level III body armor and incapacitating soft skinned vehicles by delivering over 1,900 foot pounds of energy to the target - more than four times the terminal effect of the 7.62mm NATO cartridge. 338 Norma Magnum cartridge to offer unmatched accuracy and lethality while extending the battlespace out to an impressive 1,700 meters.
50 caliber weapons, the LWMMG utilizes the highly efficient. The next generation Lightweight Medium Machine Gun (LWMMG) gives warfighters a distinct advantage in both extended and close-in fighting.
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