The IBN program makes it possible for the rail itself to act as being the barrel nut when torqued onto the rifle, totally removing the need for any independent steel barrel nut. M-LOK add-ons could possibly be mounted wherever together the URX four?s size, making it The most user configurable https://knightsarmamentrail51740.livebloggs.com/32815539/5-simple-statements-about-knights-armament-m4-quad-rail-explained