The AR-STONER Field Repair Kit is the best option on the market for replacement small parts. Keep this kit on hand during your next AR-15 build or next range trip. Problems happen, and having the right parts to make repairs in the field is critical. This kit includes standard mil-spec parts used in an AR-15, to ensure smooth and reliable operation and build saving time. Add the AR-STONER Field Repair kit to your next order to give you peace of mind.Features:Firing Pin Retaining PinFiring PinDisconnector SpringExtractor O-RingExtractor SpringExtractor PinExtractorEjectorEjector Roll PinTrigger SpringHammer SpringSafety Selector Detent Spring