The M5 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- Takedown Pin Detents, 2- Takedown Pin Springs, 2- Bolt Catch Springs, Bolt Catch Buffer, 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) and a threaded Roll Pin. Made in the USA.