Includes:1 PSA Upper Build KitBarrel nutDelta ringWeld springSnap ringDust coverHinge PinDust cover springC-clipForward assistForward assist springForward assist roll pinA high quality lower parts kit needed to assemble your AR-15 lower. Parts are 100% made in USA! Assembly takes place right here at our new facility in Columbia, SC. New Gen 2 Kit!! Features black oxide coated hammer and trigger springs. Includes: Trigger Trigger Spring Hammer Hammer Spring A2 Grip Buffer Retainer Pin Buffer Retainer Spring Trigger Guard Safety Selector Bolt Catch Spring Detent Spring Bolt Catch Plunger Bolt CatchDisconnecter Disconnecter Spring Magazine Catch Spring Bolt Catch Roll Pin Magazine Release Button Magazine Catch Pivot Pin Selector Spring Safety Selector Detent Rear Take Down Pin Takedown Pin Detent