Introducing the Palmetto State Armory PA10 Classic Lower Build Kit. Included is everything you need to assemble your PSA PA10 Stripped Lower Receiver: -Mil-Spec Fire Control Group- Magazine Catch Assembly- Front and Rear Takedown Pins, Springs, and Detents- PA10 Bolt Catch Assembly- Safety Selector Assembly- Grip Assembly- Six-Position, 7075-T6, PA-15 Buffer Tube- Carbine Spring- Latch Plate- Castle Nut- PA10 Short Buffer *The AR10 platform does not enjoy a common design between manufacturers. As a result, there can and will be subtle differences in the parts of various manufacturers. For best results, we recommend only using PSA PA-10 components with our upper and lower receivers. We do not recommend using other manufacturer's components, we cannot guarantee PSA parts will fit and function with other AR-10 brands.