Main part of the URX 3.1 rail is 12 3/8" long with an overhang of 7/8" in the front. Total length is 13 1/2".
Rail features short picatinny rails front and rear with slick sides in the middle on left, right, and bottom. There are 4 anti-rotation QD sling swivel sockets, 2 front, 2 rear. The bottom rail is removable.
Includes: URX 3.1 Handguard, barrel nut and screws to attach bottom rail.
Requires: Knight's Armament SR25 URX barrel nut wrench and vice block to clamp and align URX with upper receiver.