This is a PSA 16" Mid-Length Pencil 5.56 NATO 1/7 Nitride 15" Lightweight M-lok Upper - With BCG, CH, & MBUS Sight Set. Has probably around 650 rounds through it with no problem. Asking for $250, not willing to trade. Message me on here or text my cell at 4zero7-six1five-1two9five.