The Colt AR-15 Field Repair Kit contains high quality components for the AR-15 made to strict military specifications. This genuine Colt product will provide excellent fit and reliable function in your AR series rifle and is perfect for upgrading existing components or replacing worn or broken parts. IncludesGas RingsTrigger SpringHammer SpringBolt Catch Roll PinBolt Catch SpringDisconnect SpringBolt Catch PlungerHammer Pin RetainerMagazine Catch SpringHammer & Trigger PinSpring Detent Takedown PinDetent Takedown PinFire Control Selector DetentEjector And Safety Detent SpringBuffer RetainerBuffer Retainer SpringTakedown PinFiring PinFiring Pin Retaining Pin