The IBN procedure lets the rail alone to act as the barrel nut when torqued on to the rifle, absolutely doing away with the need for a different steel barrel nut. M-LOK add-ons may be mounted anywhere together the URX 4?s length, which makes it one of the most consumer https://knights-armament-m4-quad96295.vidublog.com/26257068/what-does-kac-rail-mean