KAK Industries Lower, BCM upper, 16" Aero Precision 300blk barrel with pistol gas. 12" keymod rail, Ambidextrous charging handle, FailZero Nickel Boron BCG, magpul SL Grip, Magpul CTR Stock. Comes as shown with 1 steel mag. Everything is new with no rounds fired besides the BCG and trigger hammer, which has a roughly 250 rounds fired.