Briefing: The M16A4 rifle is part of the Modular Weapon System (MWS) program. The M16A4 incorporates a Military-Standard (MIL-STD) M1913 rail adapter system (RAS) that allows rapid mounting of accessories such as dayight/thermal optics, infrared laser pointers, flashlights and the M203 grenade launcher. The MWS reduces the number of components required to attach accessories and allows the operator to configure it. The M16A4 entered service in 2003, replacing the M16A2.
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