The CMMG AR-15 Lower Parts Kit covers the small parts you need to finish a mil-spec AR-15 lower receiver, with two deliberate omissions: no grip and no fire control group . CMMG ships this version for builders who are running an upgraded trigger and grip (a very common build path) and don't want to pay for parts they're going to set aside. Whats included: Takedown pins (front + rear) Takedown detents and springs Bolt catch + bolt catch roll pin Magazine catch + button + spring Selector / safety detent + spring Pivot pin detent + spring Buffer retainer + spring Whats NOT included (intentional): Pistol grip Fire control group (hammer, trigger, disconnector, springs/pins) Trigger guard If you also need a trigger guard, see the Geissele Ultra Precision 5-Axis Trigger Guard for an upgrade over the standard polymer factory piece. Key features: All parts meet or exceed mil-spec Drop-in fit for any mil-spec AR-15 lower receiver Sized for builds or repairs - common spares to keep on the shelf What you get: 1x CMMG AR-15 LPK without grip / fire control group