2 rail. I've shot 18s with rifle gas like how sleek and correct they are. I'm able to set more money into overall performance areas then clone correct sections similar to a ops brake and collar that I don't have a can for. KVC’s line of upgrade options for popular https://israeljweow.activosblog.com/28907579/new-step-by-step-map-for-knights-armament-m4-quad-rail