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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).〔http://rodgers.smartvideochannel.com/media/playvideo.aspx?f=flash7&cid=241C97BA634C4EA38522E63059B39D9B&v=mostviewed〕 Procurement of the XM312 will allow easier use of the XM307, as only the related kits would have to be adopted.〔(M312 .50-Caliber (12.7mm) Machine Gun - Global Security )〕 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.〔("US Army contracts GDATP to develop new machine gun" - Jane's International Defence Review, May 20th 2008 )〕 The Army at present will continue buying new M2s and Mk 19s to replenish the current guns that are wearing out.〔http://www.strategypage.com/htmw/htweap/articles/20080915.aspx〕 ==Specifications== * Weight: * * 40 pounds (20 kg) max. (weapon only). * * 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). * * 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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「XM312」の詳細全文を読む スポンサード リンク
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