What sets the M4 RAS other than other two-piece quad rails on the market is it securely locks to the rifle’s barrel nut via a clamp and screw arrangement, making it a very sound foundation on which to mount tactical components. Contains a few KAC 11 Rib Rail Panels. For https://keeganslgyo.thenerdsblog.com/32072364/a-review-of-knights-armament-m4-quad-rail