The IBN system enables the rail itself to act as being the barrel nut when torqued on to the rifle, absolutely doing away with the need for any different metal barrel nut. M-LOK equipment can be mounted any place along the URX four?s duration, which makes it Probably the most https://knights-armament-m4-quad75184.ivasdesign.com/48600856/5-easy-facts-about-knights-armament-m4-quad-rail-described