Also looking to trade a used PWS FSC 556 comp for a Smith Ent. Vortex. Trade straight across, prefer FTF ONLY trades im looking for currently are a receiver height railed gas block, upper parts kits, a new carrier key, and a new firing pin, both for the AR/m16. AR15 bolt carrier group, came out of the LMT upper, believe it maybe LMT as well, bolt is marked CM for Continetal Manufactuering. $100 BlackHole Weaponry 5.56 barrel, 16 inch, polyagnal rifling. Custom medium profile, professionally threaded for suppressor/fh by Tornado Tech. Had a set screw type gas block on it. Less than 50 rounds through it. $120 SPF If shipped, it will be at your expense. Thanks!