AR-15 Milspec Contract Parts: All parts made in USA Includes the following lower receiver parts for AR-15 :Black A2 Pistol Grip Pistol Grip ScrewPistol Grip Lock WasherTriggerTrigger SpringHammerHammer SpringDisconnectorDisconnector SpringHammer Pin & Trigger Pin .154SelectorSelector SpringSelector DetentMagazine CatchMagazine Catch Spring Aluminum Magazine Catch Button Bolt CatchBolt Catch Detent Bolt Catch Spring Bolt Catch Roll Pin Take Down Pin Take Down Detent Take Down Detent Spring Front Pivot Pin Front Pivot Pin Detent Front Pivot Pin Detent Spring Aluminum Trigger GuardTrigger Guard Roll PinBuffer Retainer DetentBuffer Retainer Spring