Thermal sights on the other hand uses the heat signature of the targets to acquire the target. Optical sights are mainly used in the daytime, designed to replace the mechanical sights found on the M16A2, with the reticle being a red chevron pointing to the bullet's impact point at a set distance. The sling is attached to the sides of the M4, unlike that of the M16A2/A4, which is attached to the underside of the weapon, making it easier for patrolling soldiers to ready their weapon. It uses a telescopic stock, with the extended position supporting aimed firing, and the retracted position supporting hip-firing. The handguard of the M4 is rather short, with a 368.3mm barrel, around 140mm shorter than that of the M16A2. Both the M4 and the M4A1 employ the 5.56mm SS109 (M855) NATO round (with the US army using the improved M855A1, and the marines using the Mk318), and uses the gas-operated rotating bolt action found on the M16. The first version of the M4 provided to the US army had only a semi-auto and a 3-round burst mode, and was changed to a semi-/full-auto after special forces expressed their dislike of the limiting mechanism of the M4. The aluminum insulation layer and the handguard was subsequently thickened. ![]() However it was found that the barrel had a tendency to overheat easily, with the handguard reaching temperatures unsuitable for contact by hand after only 6 magazines are expended while on full-auto. ![]() The M4 and the M16 have 80% of their parts exchangeable. Employing the same gas block, air-cooled barrel and a rotating bolt, as well as a box magazine and a selective fire function, the M4 has its barrel shortened to 368.3mm, making it lighter and shorter than the M16, enabling the shooter to acquire the target faster in close-range combat. The design of M4 carbine traces back to the early carbine versions of M16 and the XM117, both derivatives of the CAR-15(which has disputed meanings, and commonly refers to the many carbine versions of the Colt AR-15, however, technically, this only stands for the CAR-15 weapons system by Colt in the 1960s) by Eugene Stoner. Feed system: 20- or 30-round box magazine. ![]() Length: 838mm / 757mm (stock extended/retracted).Weight: 2.88kg / 3.4kg (with 30-round magazine).It is employed by militaries and police forces worldwide. M4 carbine is the shortened version of the M16 assault rifle developed by Eugene Stoner.
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