Carbine M4, or M4 Carbine, is a short and light version of the M16 assault rifle. M4 carbine has 80% of the same parts as M16A2. M4 has a semi-automatic shot and three-point burst (same as M16A2), while M4A1 has a semi-automatic and automatic selection. M4A1 is also sometimes equipped with a heavier barrel, to withstand the heat generated from the automatic firing for a long time.
OutlineM4 and M4A1 use 5.56 x 45 mm NATO caliber bullets. Both are selective-fire rifles, which use a gas system, water-cooled, wearing a magazen box, and have a telescopic bar. These can be exchanged for regular butters, but they are rarely done in the United States military.
Like a carbine in general, M4 is more comfortable to carry than a long-barreled rifle. Besides ideal for use by non-infantry soldiers (such as vehicle drivers, aides, and staff officers), this also makes M4 suitable for close combat and special forces operations. M4 had become the standard for United States Special Operations Command (USSOCOM) and became the choice of US Army Special Forces. In 2006 Malaysia also purchased Karabin M4 to replace the Steyr AUG rifle.
M4 carbines were developed and manufactured for the United States Government by the Colt arms company, which contracted to produce the M4 carbine family until 2009. But in addition to Colt, a number of other weapon manufacturers also offer M4-like rifles. M4 and M16A4 have replaced M16 and M16A2 in US armed forces. M4 also replaces submachine gun M3A1 commonly used tank riders. M4 is almost similar to previous M16 compact version, that is XM177, the difference is M4 does not use bullet M193 / 6 ball.
History and variants
In addition to the first shipment, all new M4 and M4A1 existing in the United States military are already using flat top tops equipped with standard M1913 or Picatinny rail railings, which are used to install a variety of viewfinder devices. The model numbers used by the United States military are Colt Model 920 (M4) and 921 (M4A1).
M4A1
M4A1 carbine is a modification of the M4 carbine, which is made for special forces. M4A1 is widely used in US special forces, such as Delta Force, Navy SEALS, and Force Reconnaissance. This rifle becomes the choice of special forces and anti-terrorist forces, due to its size and its ability to shoot full-automatic. These features are very useful for urban battles. Although the M4A1 does not have firing range as far as the M16 rifle, many military observers think that shooting targets above 300 meters without a special rifle is unnecessary. M4A1 is very effective at a distance of 150 meters.
SOPMOD Block IIThe second-generation SOPMOD is being planned, with many companies competing to get their contracts. Some leading companies, together with their designs, are Knight's Armament Company with URX II, ARMS with Selective Integrated Rail (SIR) system, and Lewis Machine & Tool with Monolithic Rail Platform (MRP).
Other variantsOther variants of the M4 carbine are also manufactured by other manufacturers, and used by special forces other than the United States, such as the Australian Special Air Service Regiment (SASR), Malaysian Police Special Forces Movement, and the Anti-Terror Detachment 88 Police. In addition, SAS UK uses also made Diemaco M4 named C8. Although Diemaco was finally purchased by Colt, and named Colt Canada, the names of the Diemaco rifle were unchanged.
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