What sets the M4 RAS aside from other two-piece quad rails available is always that it securely locks for the rifle’s barrel nut by means of a clamp and screw arrangement, rendering it an extremely sound foundation upon which to mount tactical components. Posted by BRAD on twenty third Jan https://m4rashandguard19506.blogocial.com/the-best-side-of-knights-armament-m4-quad-rail-65506707