Pro conversion. Krebs sights. (Ghost ring and AR style front sight). Chaos door breaching brake. Ace folding stock and internal receiver block. MD Arms (merlot style grip). Tromix trigger guard and charging handle attachment. Bolt, carrier, and feed ramps polished by Cobra Custom. DPS Arms customized tri-rail. Fab Defense front grip. JT Engineering extended mag release. Tripod, upper gas block heat guard. This is a four port gun in the correct diamond pattern. No trades, thank you. Comes with MD Arms 1 x 20 rnd drum. 4 x gen 2 agp 10 rnd mags. 1 x Russian 5 rnd $1,500.00 firm.