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Lightweight Medium Machine Gun
The Lightweight Medium Machine Gun (LWMMG) is a prototype machine gun being developed by General Dynamics.
==Design==
The LWMMG is designed to fill the gap between 7.62 mm and .50 BMG machine guns. The weapon uses the .338 Norma Magnum round, giving it greater lethality and double the range of the 7.62 NATO round. The LWMMG has a rate of fire of 500 rounds per minute, an effective range of 1,700 meters (1,860 yards), and a maximum range of 5,642 meters (6,170 yards). It weighs 24 pounds, making it only slightly heavier than the M240L, and lighter than the M240B. The .338NM bullet has over of muzzle energy and is four times more powerful than the 7.62 NATO at 1,000 meters. An individual round is twice as heavy (45.5 grams compared to 24 grams), as are each belt link (8 grams compared to 4 grams). For each weapon to fire for one minute, a belt of 500 .338NM rounds would weigh , while a belt of 800 7.62 NATO rounds would weigh . The LWMMG is operated by a gas-operated, long-stroke piston with a rotating bolt located under the barrel and fires from an open bolt. It uses “Short Recoil Impulse Averaging” technology, patented by General Dynamics and previously used on their XM806 machine gun, where the entire barrel, barrel extension, gas system, and bolt assembly recoil inside the outer housing. The LWMMG is equipped with a quick-change barrel, quad picatinny rails, collapsable stock, and can be used by dismounted troops or mounted on a platform.〔(General Dynamics Unveils New Medium-caliber Machine Gun at Joint Armaments Conference in Seattle ) - General Dynamics Press Release, 15 May 2012〕〔(.338 NM Lightweight Medium Machine Gun (LWMMG) ) - Thefirearmblog.com, 16 May 2012〕〔(GD Lightweight Medium Machine Gun / LWMMG ) - World.Guns.ru〕
The LWMMG is pitched as being a bridge between 7.62 NATO and .50 BMG machine guns. While the M240 has an effective range of 1,100 m, the LWMMG fires a .338 bullet that can provide effective and accurate fire out to 1,700 m. General Dynamics officials say their machine gun is not meant to be a replacement for the M240, but to give the ability to put effective fire on targets at extended ranges. 100 rounds of 7.62 NATO weighs , while a 100 round box of .338 Norma Magnum weighs . The LWMMG can be mounted on an M240 mount and costs about the same. While the company is satisfied with the shorter .338NM cartridge's performance, the gun could easily be converted to .338 Lapua Magnum. The gun's short recoil operating system causes the barrel to reciprocate, similar to the M2 machine gun. This combined with a gas system to minimize recoil balances positive and negative recoil forces, allowing a gunner to fire a round with significantly greater energy but with the recoil profile similar to a 7.62 mm round from an M240.〔(GD Shows Off Long-Range Machine Gun ) - Kitup.Military.com, 25 September 2013〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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