Geissele's Standard Parts Kit includes everything needed to rebuild or complete your lower receiver. This Kit Includes: Takedown Pin & Pivot Pin Detents (2)Takedown Pin & Pivot Pin Springs (2)Takedown Pivot PinBolt Catch PlungerBolt Catch SpringBolt Catch Coiled PinMil-Spec Bolt CatchSafety DetentBuffer RetainerBuffer Retainer SpringSafety Detent Spring Takedown PinMagazine Release ButtonMagazine Release SpringGeissele Posi-Snap Safety Magazine CatchCoiled Trigger Guard PinMil-Spec Trigger Guard Geissele Standard Lower Parts Kit w/NO Grip 05-343