The IBN process lets the rail alone to act given that the barrel nut when torqued on to the rifle, absolutely removing the need for just a individual steel barrel nut. M-LOK add-ons can be mounted anyplace along the URX 4?s size, which makes it One of the more consumer https://kacrail74073.blogmazing.com/26345777/the-ultimate-guide-to-knights-armament-m4-quad-rail