M4 is simply the shorter version of M16 which was developed by Colt company since 1970s. These carbines are intended for military and law enforcement use only but it seem civilians are able to get hand on as well. In 1997, the US military has adopted use of M4a1 or M4 carbine instead of M16 which was used during Vietnam War. Caliber: 5.56mm NATO
Action: Gas operated, rotating bolt
Overall length: 838 mm (stock extended); 757 mm (stock fully collapsed)
Barrel length: 370 mm
Weight: 2.52 kg without magazine; 3.0 kg with magazine loaded with 30 rounds
Rate of fire: 700 - 950 rounds per minute
Maximum effective range: 360 m
With its greater flexibility and effectiveness, the M4 carbines quickly replaced M16 and were widely developed further in many special military organization. Especially, the Special Operation Command (SOCOM) was very interested in standardizing its basic weapon as M4.
Soon enough, M4 RIS (Rail Interface System) was introduced and gave a whole wider options for accessories and upgrades to M4 such as ACOG Reflex red-dot sight, EOTECH Halo system, NVG telescopic, magnifier scope, etc. Making it the universal weapon or as Thais would call it "ปืนพระเอก". Without a doubt, M4 is one of the best interface designed guns out there. I will update piture of my own custom airsoft M4. Check it out soon!
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