Knight's Armement KeyMod Skeletonized Barrier Stop and Sling Mount
Barrier stop mounts to the Knight's Armament URX 4 handguard, helps keep the gun from sliding when braced up against a barrier. Works best on wooden barriers but will still help with concrete and other hard surfaces. This updated version will now allow the barrier stop to be mounted so that it will overhang the end of the handguard if desired. The barrier stop also provides a mounting socket for HD style sling swivels (sold separately). The swivel will not rotate in the barrier stop so you don't have to worry about your sling getting twisted up.