The AR-STONER Complete Lower Receiver Parts Kit for the AR-15 platform is the perfect choice if you are looking to build your next AR-15. This kit includes all the standard mil-spec parts used in an AR-15 lower receiver to ensure smooth and reliable operation. The AR-STONER complete lower parts kits offers an economical way to build a complete lower, less a stock assembly of your choice and a stripped lower receiver. Kit Includes:Bolt CatchBolt Catch PlungerBolt Catch Roll PinBolt Catch SpringBuffer RetainerBuffer Retainer SpringDisconnectorDisconnector SpringHammerHammer PinHammer SpringMagazine CatchMagazine Catch ButtonMagazine Catch SpringA2 Pistol GripPistol Grip Lock WasherPistol Grip ScrewPivot PinPivot Pin DetentPivot Pin Detent SpringSelectorSelector DetentSelector Detent SpringTakedown PinTakedown Pin DetentTakedown Pin Detent SpringTriggerTrigger GuardTrigger Guard Roll PinTrigger PinTrigger Spring Note: If you experience problems with the j clip inside the hammer, the cl...