No one likes to ruin a trip to the range when something goes wrong with your rifle. 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! Includes: AR15 Takedown Pin Detent (2) Takedown Pin Spring (2) Roll Pin, Fwd Assist (2) Bolt Catch Spring (2) Bolt Catch Buffer Bolt Catch Roll Pin (2) Trigger/Hammer Pin Safety Selector Spring Safety Selector Detent Buffer Retainer Buffer Retainer Spring (2) Trigger Guard Roll Pin (2) Pistol Grip Screw Pistol Grip Lock Washer Trigger Spring Hammer Spring Disconnector Spring Nylon Tipped Tension Set Screw - 1/4-28 x 1/2 4-40 Set Screw (for threaded takedown pin detent hole) (2) Threaded Roll Pin M4E1 Lower Bolt Catch Pin