WHAT DOES KAC RAS RAIL MEAN?

What sets the M4 RAS besides other 2-piece quad rails available on the market is always that it securely locks towards the rifle’s barrel nut by way of a clamp and screw arrangement, making it an exceedingly stable foundation upon which to mount tactical components. Incorporates three KAC 11 Rib Rail Panels. For other rib panel lengths and colors