The rifle must have a carbine length gas system, delta ring assembly, fixed front sight/gas block, and round handguard end cap. The KAC M4 RAS is a drop-in replacement part for standard, 2-piece polymer, M4-type handguards. What sets the M4 RAS apart from other 2-piece quad rails on the market is that it securely locks to the rifle’s barrel nut via a clamp and screw arrangement, making it a very solid foundation upon which to mount tactical accessories. This handguard is a simple-to-install, drop-in upgrade that features genuine Mil-Spec M1913 Picatinny Rails along its entire length. With over 1 million rails issued to date, it is one of the most battle proven designs available for the AR15 platform.
The Knights Armament M4 RAS (Rail Adapter System) was developed for use on US military M4 Carbines utilized a 14.5 or 16″ barrel. Knights RAS 7″ Drop-In AR15/M4 Carbine Length Quad Rail Description:
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