Knight's m4 ras (rail adapter system) was developed for use on the us military's m4 carbine, and with over 1 million rails issued to date, it is one of the most battle proven designs available for the ar-15 platform.This non-free float handguard is a simple-to-install, drop-in upgrade that features genuine mil-spec m1913 picatinny rails along its entire length.What sets the m4 ras apart from other 2-piece quad rails on the market is that it securely locks to the rifles barrel nut via a clamp and screw arrangement, making it a very solid foundation upon which to mount tactical accessories.Includes three kac 11 rib rail panels.Rifle requirements- the m4 ras is a drop-in replacement part for standard, 2-piece polymer, m4-type handguards.The rifle must have a carbine length gas system, delta ring assembly, fixed front sight/gas block and round handguard end cap.Lighter barrel profiles work best (m4 or government contours).Heavier barrel contours may require modification to the inside of the rail.*for ar-15/sr-15 based platforms only; not compatible with sr-25 variants.Installation instructions are included.

Firearm Model: AR-15/SR-15
Material: Aluminum
Finish: Black Anodized
Free Floating: No