![]() Later, the gun was updated with improved furniture, and a barrel with rifling of 1 turn in 7 inches (180 mm). The XM4 was tested by the Army's Armament Research and Development Center (ARDC) in June 1983. In 1983, the 9th Infantry Division requested a Quick Reaction Program (QRP) for a 5.56mm carbine to replace the M1 Carbine and M3 submachine gun in service. The carbine used the same upper and lower receiver as the M16A1, and fires the M855 cartridge along with the older M193 cartridges. Army redesignated the XM177E2 to the XM4 Carbine, giving the name as the successor to the M3 Carbine. Army Armament Munitions Chemical Command helped Colt develop a new variant of the XM177E2, and the U.S. At the time, the Colt M16A2 was the Colt 645, also known as the M16A1E1. Government requested Colt to make a carbine version of the M16A2. However, these rifles had design issues, as the barrel length was halved to 10 inches (25 cm), which upset the ballistics, reducing its range and accuracy and leading to considerable muzzle flash and blast, meaning that a large flash suppressor had to be fitted. 2.1.1 Special Operations Peculiar Modificationįollowing the adoption of the M16 rifle, carbine variants were also adopted for close quarters operations, the first of which was the CAR-15 family of weapons, which served through the Vietnam War.Army selected the SIG MCX SPEAR as the winner of the Next Generation Squad Weapon Program to replace the M16/M4. Since its adoption in 1994, the M4 has undergone over 90 modifications to improve the weapon's ergonomics and modularity, including: the M4A1, which strengthened the barrel and removed the burst-fire option the SOPMOD, an accessory kit containing optical attachments and the underbarrel M203 grenade launcher. The M4 has been adopted by over 60 countries worldwide, and has been described as "one of the defining firearms of the 21st century". The M4 is extensively used by the United States Armed Forces, with decisions to largely replace the M16 rifle in United States Army (starting 2010) and United States Marine Corps (USMC) (starting 2016) combat units as the primary infantry weapon and service rifle. It is a shortened version of the M16A2 assault rifle. The M4 carbine is a 5.56×45mm NATO, gas-operated, magazine-fed, carbine developed in the United States during the 1980s. Gas-operated, closed rotating bolt, Stoner expanding gasģ0-round box magazine or other STANAG magazines. ![]()
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