For AR15/SR15 based platforms only not compatible with SR-25 variants. Heavier barrel contours may require modification to the inside of the rail. Lighter barrel profiles work best (M4 or Government contours).

The rifle must have a carbine length gas system, delta ring assembly, fixed front sight/gas block, and round handguard end cap. 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. The KAC M4 RAS is a drop-in replacement part for standard, 2-piece polymer, M4-type handguards. This handguard is a simple-to-install, drop-in upgrade that features genuine Mil-Spec M1913 Picatinny Rails along its entire length. Troy Carbine Length Battle Rail AR-15 Drop-In Quad. 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. Slim Profile Drop-in M-LOK Handguard for Carbine-Length AR-15 B5 Systems makes some of the best. This handguard is a simple-to-install, drop-in upgrade that features genuine Mil-Spec M1913 Picatinny Rails along its entire length. Whether you’re looking for a free-float system or a traditional handguard, a lightweight AR-15 handguard or quad rail handguard, we’ve got you covered with some of the best names in the industry at amazing prices. With over 1 million rails issued to date, it is one of the most battle proven designs available for the AR15 platform. We offer the best AR-15 handguards for both rifles and carbines. 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:

Carbine length quad rail handguard