What sets the M4 RAS other than other 2-piece quad rails out there is it securely locks towards the rifle’s barrel nut by using a clamp and screw arrangement, which makes it an extremely strong foundation upon which to mount tactical extras. Posted by BRAD on 23rd Jan 2020 Magnificent https://m4rasrail64184.blogofoto.com/60706711/facts-about-knights-armament-m4-quad-rail-revealed