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The distinctive step in its barrel is for mounting the M203 with the standard hardware. However, these carbines had design issues, as “the barrel length was halved” to 10 inches which “upset the ballistics”, reducing its range and accuracy and “led to considerable muzzle flash and blast, so that a large flash suppressor had to be fitted”. Colt Commando and later the M16A2 rifles. In 1984, the first model was made, and it was tested in May 1985.
The first model have a Upper A1 Sight, and was given a shorter 11. 5-barrel, but later it was giving a longer 14. 5-inch barrel for the bayonet and the M203 Grenade Launcher. The XM4 was also given the cartridge deflector, as well as other minor refinements.
In May 1991, the XM4 was renamed to the M4, and Colt made a manual. M4 into service to replace M16A2s in certain roles. M4 as its standard infantry rifle. E5 and below are also issued M4s instead of the M9. As of 2013, the U. Marine Corps had 80,000 M4 carbines in their inventory.
By July 2015, major Marine Corps commands were endorsing switching to the M4 over the M16A4 as the standard infantry rifle, just as the Army had done. Approval of the change would move the M16 to support personnel, while armories already had the 17,000 M4s in the inventory needed to outfit all infantrymen who needed one. M4 carbine the primary weapon for all infantry battalions, security forces, and supporting schools in the U. The switch was to begin in early 2016 and be completed by September 2016. In December 2017, the Marine Corps revealed a decision to equip every Marine in an infantry squad with the M27, replacing the M4 in that part of the service. On 1 July 2009, the U. Army took complete ownership of the M4 design.
This allowed companies other than Colt to compete with their own M4 designs. The Army planned on fielding the last of its M4 requirement in 2010. On 30 October 2009, Army weapons officials proposed a series of changes to the M4 to Congress. The benefits of this, however, have come under scrutiny from both the military and civilian firearms community. According to a PDF detailing the M4 Carbine improvement plans released by PEO Soldier, the direct impingement system would be replaced only after reviews were done comparing the direct impingement system to commercial gas piston operating system to find out and use the best available operating system in the U.
In September 2010, the Army announced it would buy 12,000 M4A1s from Colt Firearms by the end of 2010, and would order 25,000 more M4A1s by early 2011. The service branch planned to buy 12,000 M4A1 conversion kits in early 2011. In late 2011, the Army bought 65,000 more conversion kits. From there the Army had to decide if it would upgrade all of its M4s. On 21 April 2012, the U. Army announced to begin purchasing over 120,000 M4A1 carbines to start reequipping front line units from the original M4 to the new M4A1 version. Remington was to produce the M4A1s from mid-2013 to mid-2014.