KAC URX 3.1, these rails are hard to come by. When found they are selling for $1000-1200 alone. Upper is BCM, barrel is CMMG heavy profile .223 Wylde, surefire closed flashhider. Bcm gas tube and gas block, all professionally assembled and gas block pinned by D Wilson. Iron sights and pressure pad not included, no Bcm or CH. Looking for $1600 shipped Very low round count 480 762 8404