Geissele's Standard Lower Parts Kit includes all the internal parts necessary to complete or rebuild your lower receiver and grip. This quality mil-spec kit features an improved safety detent and Geissele's specially designed Posi-Lock safety, which provides the end user a satisfying and positive tactile feedback when engaging the safe or fire position. This Kit Includes: Takedown Pin & Pivot Pin Detents (2)Takedown Pin & Pivot Pin Springs (2)Takedown Pivot PinBolt Catch PlungerBolt Catch SpringBolt Catch Coiled PinBolt CatchSafety DetentBuffer RetainerBuffer Retainer SpringSafety Detent Spring Takedown PinMagazine Release ButtonMagazine Release SpringGeissele Posi-Snap Safety Magazine CatchCoiled Trigger Guard PinMil-Spec Trigger GuardGrip ScrewGrip Screw WasherGripHex Key Geissele Automatics Geissele Standard Lower Parts Kit w/Grip 05-987