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The M4-M4A1 conversion increases weapon weight from 7.46 lb (3.38 kg) to 7.74 lb (3.51 kg), counting a back-up iron sight, forward pistol grip, empty magazine, and sling. Each carbine upgrade costs $240 per rifle, for a total cost of $120 million for half a million conversions.
The designation of M468 stands for an M4 carbine chambered for the 6.8mm SPC cartridge. It was an attempt to create an optimal Special Operations close-to-medium range carbine for Close Quarter Battle (CQB). A 12-inch barreled micro-carbine and 16-inch barreled carbine version were created. Barrett ceased manufacturing the rifle in 2010. [4]
An M855 fired from a shorter barreled M4 carbine exhibits a bullet velocity of 2,522 ft/s (769 m/s) at 150 m (164 yd) range. Even if it impacts at optimum speeds, 70 percent of 5.56 mm bullets will not begin to yaw until 4.7 in (120 mm) of tissue penetration. 15 percent more begin to yaw after that distance, so up to 85 percent of rounds that ...
An M4 carbine, a common AR-15–style carbine. The M4 is the shorter, lighter carbine variant of the M16 rifle.. A carbine (/ ˈ k ɑːr b iː n / KAR-been or / ˈ k ɑːr b aɪ n / KAR-byn) [1] is a long gun that has a barrel shortened from its original length. [2]
The Bushmaster M4 [2] or M4A3 [3] is a semi-automatic or select-fire carbine size assault rifle manufactured by Bushmaster Firearms International, modeled on the AR-15. It is one of the Bushmaster XM15 line of rifles and carbines.
The Heckler & Koch HK416 is an assault rifle chambered for the 5.56×45mm NATO cartridge.It is designed and manufactured by the German company Heckler & Koch.. Although the design is based on the AR-15 class of firearm (specifically the Colt M4 carbine family issued to the U.S. military), it uses a proprietary short-stroke gas piston system from Heckler & Koch's earlier G36 family of rifles.
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The Canadian company Colt Canada (formerly Diemaco) licensed production of a rifle (Colt Model 715) and carbine (Colt Model 725), but later went on to produce an entire line of AR-15/M16 pattern weapons developed independently. In May 2005, Colt's Manufacturing Company acquired Diemaco, and the name was changed to Colt Canada.