Universal Parts Kit includes a full range of replacement parts.Includes:< b>1 Front bolt ORing2 Valve lock screw1 Rear bolt ORing1 Front sight spring receiver dowel1 Buffer ORing1 Drive Spring1 Ball Latch1 Velocity Screw1 Adapter Nut 10322 Receiver Bolt short1 Receiver Bolt long1 Feed Elbow Dowel Pin2 Grip Nut1 Front Sight Pin1 Dowel Pin black1 Marker Oil1 Pin