BCM Quadrail 11.5" upper. Subbed in a Geissele gas block but otherwise as it came from the factory sans the paint job and no muzzle device. Not sure on the round count but sub 1k. No BCG or CH. Looking to trade straight across for a 14.5" upper either P/W or not doesn't matter, but need a mid-length gas system. BCM, SOLGW or something else in that tier, no Aero etc. Located in Georgetown. Will also sell for 500 out the door.