What sets the M4 RAS aside from other two-piece quad rails on the market is usually that it securely locks for the rifle’s barrel nut via a clamp and screw arrangement, rendering it a really sound Basis upon which to mount tactical equipment. Posted by BRAD on 23rd Jan 2020 https://simoneqajh.webbuzzfeed.com/30051286/not-known-details-about-ras-m4