What sets the M4 RAS other than other two-piece quad rails that you can buy is that it securely locks to the rifle’s barrel nut by way of a clamp and screw arrangement, which makes it an exceptionally solid foundation on which to mount tactical add-ons. Heatshields In Handguard – https://knights-armament-m4-quad72784.thezenweb.com/a-simple-key-for-knights-armament-ras-unveiled-67301720