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The M4 carbine (officially Carbine, Caliber 5.56 mm, M4) is a 5.56×45mm NATO assault rifle developed in the United States during the 1980s. It is a shortened version of the M16A2 assault rifle. The M4 is extensively used by the US military , with decisions to largely replace the M16 rifle in US Army (starting 2010) and US Marine Corps ...
M4 (5.56×45mm NATO) (the U.S. Army was upgrading and retrofitting their existing stock of M4 carbines to the specifications of the M4A1, starting in 2014 and was predicted to be completed by 2020) [needs update]
The basic infantry weapon of the United States Marine Corps is the M27 Infantry Automatic Rifle. Suppressive fire is provided by the M240B machine gun, at the squad and company levels respectively. In addition, indirect fire is provided by the M320 grenade launcher in fireteams, M224a1 60 mm mortar in companies, and M252 81 mm mortar in battalions.
The M4 carbine was developed from various outgrowths of these designs, including a number of 14.5-inch (368 mm)-barreled A1 style carbines. The XM4 (Colt Model 720) started its trials in 1984, with a barrel of 14.5 inches (370 mm). The weapon became the M4 in 1991.
There is also a military M4 Type Carbine which comes with a 14.5 in (370 mm) barrel and a removable "bird cage" flash suppressor. [5] An M4 Type Post-Ban Carbine was developed for the 1994 United States Federal Assault Weapons Ban requirements. Since the ban expired in 2004, this rifle has essentially been replaced by the M4A2 and M4A3.
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 ...
For example, until October 2015, when the M4 carbine was approved as the new standard-issue rifle, the M16A4 rifle was still standard issue throughout the United States Marine Corps. The barrel on the Mk 12 Special Purpose Rifle , the current rifle used by the squad designated marksman in the USMC, is only 500 mm (18 in) long - 50 mm (2 in ...
The Colt Model 933 is a compact carbine based on the AR-15, M16 rifle and M4 Carbine produced by Colt starting in 1995. Due to its compact size, the short-barreled Colt 933 continues to be used by various US Special Forces and by some foreign forces, including Israeli Special Forces.