The IBN system allows the rail itself to act because the barrel nut when torqued onto the rifle, absolutely eliminating the need for just a separate metal barrel nut. M-LOK equipment may be mounted anyplace along the URX 4?s length, making it Among the most consumer configurable styles available on https://knights-armament-m4-quad96295.vidublog.com/26257068/what-does-kac-rail-mean