The Geissele 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 our specially designed Posi-Snap safety, which provides the end user a satisfying and positive tactile feedback when engaging the safe or fire position. FeaturesTakedown Pin & Pivot Pin Detents (2) Takedown Pin & Pivot Pin Springs (2)Takedown Pivot Pin Bolt Catch PlungerBolt Catch Spring Bolt Catch Coiled PinBolt Catch Safety DetentBuffer Retainer Buffer Retainer SpringSafety Detent Spring Takedown PinMagazine Release Button Magazine Release SpringPosi-Snap Safety Magazine CatchCoiled Trigger Guard Pin Mil-Spec Trigger GuardGrip Screw Grip Screw WasherA2 Pistol Grip