Spike's Tactical Enhanced Lower Receiver Parts Kit, 223 Rem/556NATO, KNS Gen II ModII Anti-Rotation Pins, Spikes Billet Trigger Guard, ST Battle Trigger, Ambi Safety Selector, Bolt Catch, Mag Catch, Mag Catch Button, Detents, Plungers, Pins, Springs, Black Finish SLPK301 If you're looking for the highest quality and most durable Lower Parts Kit on the market with all of the upgrades" look no further. The Spike's Tactical Enhanced LPK was designed for the end user who demands the most longevity possible out of the parts in their rifles. Proudly made in the USA.