What sets the M4 RAS other than other two-piece quad rails out there is it securely locks towards the rifle’s barrel nut by way of a clamp and screw arrangement, making it an extremely reliable foundation on which to mount tactical add-ons. Posted by BRAD on 23rd Jan 2020 Amazing https://kac-carbine-rail52851.bloggerbags.com/34698824/rumored-buzz-on-kac-drop-in-rail