The AR15/M4E1 Field Repair Kit features common parts that may rattle loose or break. Carry one in your range bag and always have what you need to get your rifle up and running again. Kit includes- 2- AR15 Takedown Pin Detents 2- Takedown Pin Springs 2- Roll Pins Fwd Assist 2- Bolt Catch Springs Bolt Catch Buffer 2- Bolt Catch Roll Pins Trigger/Hammer Pin Safety Selector Spring Safety Selector Detent Buffer Retainer 2- Buffer Retainer Springs 2- Trigger Guard Roll Pins Pistol Grip Screw Pistol Grip Lock Washer Trigger Spring Hammer Spring Disconnector Spring Nylon Tipped Tension Set Screw 1/4-28 x 1/2 2- 4-40 Set Screw (for threaded takedown pin detent hole) threaded Roll Pin and a M4E1 Lower Bolt Catch Pin. Made in the USA.