Spike's Tactical Enhanced Lower Receiver Parts Kit, 223 Rem/556NATO, KNS Gen II ModII Anti-Rotation Pins, Spikes Billet Trigger Guard, Ergo Grip, ST Battle Trigger, Ambi Safety Selector, Bolt Catch, Mag Catch, Mag Catch Button, Detents, Plungers, Pins, Springs, Flat Dark Earth Finish SLPK302.