The Wilson Combat TRLOWERK Lower Receiver parts kit is a comprehensive set containing all the necessary components to assemble a personalized AR rifle. The kit incorporates the same parts utilized by Wilson Combat in the production of their custom AR rifles. These components, supplied by Usgi contractors, promise superb quality since they meet or surpass Military Specifications. However, it\'s important to note that this kit does not include any fire control parts such as Hammer, Trigger, Disconnector, Springs. Parts in the kit include: Bolt Catch, Bolt Catch Plunger, Bolt Catch Roll Pin, Bolt Catch Spring, Magazine Catch, Magazine Catch Spring, Magazine Catch Button, Pivot Pin, Takedown pin, 2x Pivot/Takedown detents, 2x Pivot/Takedown detent springs, Safety Detent, Safety Detent Spring, Semi-Auto Safety selector (designed for Right Hand use), Trigger Guard (fabricated from Aluminum GI), Trigger Guard Roll Pin, and 2x Trigger/Hammer Pins. Armed with the Wilson Combat Lower Receiver kit, you can design and complete your custom AR rifle with confidence and precision.