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Type Heavy machine gun
Place of origin United States
Production history
Designer General Dynamics/Joint Services Small Arms Program
Designed 2000
Manufacturer General Dynamics
Produced 2004
Variants XM307
Weight 52 lb (19 kg)
Length 61.42 in (1,560 mm)
Barrel length 36 in (914 mm)
Width 9.84 in (250 mm)
Height 7 in (180 mm), 18 in (460 mm) adjustable tripod
Crew 2

Cartridge .50 BMG
Caliber 0.50 in (12.7 mm)
Action "Recoil-reducing action" (modified rotating bolt)
Rate of fire 260 rpm
Maximum firing range lethal and suppressive to 2,000 meters
Feed system Belt-fed
Sights Open, optics may be mounted.

The XM312 is a heavy machine gun derived from the XM307 25 mm autocannon and chambered for the .50 BMG cartridge. It was designed in response to a request by the U.S. military for a replacement for the aging M2HB heavy machine gun, and as a complement to the heavier XM307 Advanced Crew Served Weapon.

It is capable of being converted quickly into an XM307 with a small number of parts and a few minutes of work at the unit level (and vice versa from the XM307).[1] Procurement of the XM312 will allow easier use of the XM307, as only the related kits would have to be adopted.[2]

On May 20, 2008, Jane's Information Group reported that the U.S. Army had awarded General Dynamics Armament and Technical Products (GDATP) a 9 million dollar contract to develop a lightweight .50-caliber machine gun called the XM806 to supplement the Browning M2, but was cancelled in 2012.[3] The Army at present will continue buying new M2s and Mk 19s to replenish the current guns that are wearing out.[4]


  • Weight:
    • 40 pounds (20 kg) max. (weapon only).[5]
    • 40 pounds (20 kg) max. (ground mount system).
  • Dimensions: 9.9W × 7.2H × 61.5L max. inches (251 mm × 183 mm × 1562 mm) (52.5L, 1334 mm) charged).
  • Portability: Man portable or vehicle mountable.
  • Stability: Up to 18 inch (460 mm) tripod height.
  • Operation: Currently a hybrid gas & recoil operating group. Gas powers the bolt mechanism while recoil drives the barrel/barrel extension and the feed system. Design changes are underway to totally eliminate the gas system to provide increased reliability and reduced complexity.
  • Environmental: Operationally insensitive to conditions.
  • Reliability: 6,000 MRBF (threshold) / 10,000 MRBF (objective).
  • Rate of fire:
    • 260 rounds per minute (4.3 Hz)(cyclic).[6]
    • 40 rounds per minute (0.7 Hz) (sustained, without barrel change). In burst of five to seven rounds, the same as the M2HB.
  • Dispersion: Less than 1.1 milliradian, one sigma radius.
  • Range: Lethal and suppressive out to 2,000 meters.
  • Ammunition: .50 BMG M33 ball, M8, M20 & Mk211 API, M903 SLAP.
  • Recoil: 300 foot-pounds (407 J)
  • Feed system: Weapon-mountable ammunition can or feed from any can using bellmouth attachment. M9 rear stripping link—common with current M2 ammunition. Left hand feed, right hand eject of cases and links.

Program status[edit]

  • September 2005: The XM312 is test fired by troops from the 1st Infantry Division at the Grafenwöhr Training Area in Germany.[7]


External links[edit]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/XM312 — Please support Wikipedia.
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14 news items

Strategy Page
Tue, 15 Nov 2011 03:15:00 -0800

This is about half the rate of the M2, and was believed adequate for the 25mm smart shells the XM312 was originally designed for (as the XM307). But for 12.7mm bullets, it didn't impress the troops. There were some reliability problems (the M2 has only ...
Strategy Page
Wed, 22 Dec 2010 10:33:45 -0800

An earlier attempt (the XM312) by General Dynamics did not work out so well. Actually, there are several other competitors for this project, and several failed attempts in the last few decades. The army wants a weapon that weighs about half as much as ...

Next Big Future

Next Big Future
Thu, 24 Oct 2013 16:00:12 -0700

The XM312 50 caliber gun could also be carried and used by one soldier in exoskeleton armor It delivers lethal and suppressive fire out to 2,000 meters. New electric (1000-1500 Wh/kg batteries) and combustion engines could be up to the task. The person ...
Wed, 06 Mar 2013 04:03:08 -0800

Once the M85 was toast, the Army went to designing first XM806 and then the XM307/XM312 advanced heavy weapon. Touted as being a 50-pound alternative to the M2, it uses a smart shell that is capable of doing everything but making you dinner on a ...
The Vancouver Observer (blog)
Thu, 25 Mar 2010 00:00:00 -0700

PM Soldier Weapons has near term plans to begin integration of their advanced Crew Served Weapons family, including the XM307 and XM312. The weapons operate off of a larger ammunition supply than that of the standard crew-served weapons.
Mon, 21 Apr 2014 17:50:28 -0700

武器组成可以增加XM312大口径机枪、25毫米XM307自动榴弹发射器、“地狱火”和“标枪”反坦克导弹系统、非致命武器。研制了用于安装在快艇、护卫舰和飞行器上的版本。 该计划的主要出口成绩是2007年在美国国防部组织的CROWS ...
Army Guide
Tue, 25 Dec 2012 09:23:25 -0800

Компания GD ATP также разработала легкий пулемет XM312 калибра .50 для американской армии, который легче и имеет меньшую отдачу в сравнении с .50 M2. После завершения разработки RMG 50 и принятия его на вооружение немецкой ...
Независимое военное обозрение
Thu, 12 Jan 2006 06:37:52 -0800

В октябре на германском полигоне "Графенвер" прошли испытания автоматического гранатомета XM25, подствольного гранатомета SM320 и тяжелого пулемета XM312. По заверениям конструкторов, это высокоточное оружие, позволяющее ...

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