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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 ...
The M27 Infantry Automatic Rifle (IAR) is a 5.56mm, select-fire assault rifle / squad automatic weapon developed from the HK416 by Heckler & Koch.It is used by the United States Marine Corps (USMC) and was originally intended for automatic riflemen, [6] but now is issued to all infantry riflemen as a replacement for the M4 carbine.
A U.S. Marine armed with an M16A4 rifle and ITL MARS sight in 2004. A U.S. Marine armed with an M27 IAR affixed with ACOG Squad Day Optic. M16A2, M16A3, M16A4 – Select fire. Safe, semi, burst. Originally the basic infantry weapon, [7] mostly being replaced by M27 in infantry battalions. M4/M4A1 – Mostly being replaced by M27 in infantry ...
While the U.S. Army adopted the M4 carbine in 1994, the U.S. Marine Corps retained their 20-inch (510 mm) barrel M16A4 rifles long afterwards, citing the increased range and effectiveness over the carbine version; officers were required to carry an M4 carbine rather than an M9 pistol, as Army officers do. Because the Marine Corps emphasizes ...
The IAR6940 is gas-operated and air‐cooled, fed by box magazines such as the STANAG and Drum magazines. It is chambered in 5.56×45mm NATO and is based on the M16 rifle/M4 carbine. Similar to the CAR-15, from which it shares many fundamental features, the IAR6940 uses a direct impingement system rather than a gas piston system.
Video and pictures published by the Taliban on Twitter and elsewhere show fighters carrying M4 carbines and M16 rifles discarded by Afghan army units. The U.S. guns are more accurate and have ...
The Air Force recently reinstated making recruits carry practice M4s, citing concerns of potential conflict with peer powers like Russia or China.
The Marine Corps had long maintained the full-length M16 as their standard infantry rifle, but in October 2015 the switch to the M4 carbine was approved as the standard-issue weapon, giving Marine infantry a smaller and more compact weapon.