Mil-Spec M5 Rifle RAS for M16A4 with full rail covers

The M5 RAS is the Knights Armament-pattern Rail Adaptor System issued with the US Army's M16A4 service rifle. Hundreds of thousands were fielded across two decades of combat, making it one of the most battle-proven free-float forends in the AR-15 world. This is the mil-spec rifle-length M5 RAS for 20" M16A4 clone builds.

Built to the original KAC M5 specification, this RAS features four MIL-STD-1913 Picatinny rails at 12, 3, 6, and 9 o'clock, a clamp-on mounting system that indexes off the barrel nut and front sight base, and steel hardware throughout. It drops directly onto a standard M16A4 upper — no gunsmithing required.

The set ships complete with the full military rail cover complement: four (4) 11-rib panels, two (2) 5-rib panels, and one (1) 6-rib panel. That is the correct cover count for an issued A4, exactly as Marines and soldiers ran them in Fallujah, Ramadi, and Sangin.

If you are building a period-correct M16A4 or a 20" DMR clone, this is the forend. Order yours today and put the correct rail on your A4.