The Kaw Valley Precision AR-15 Buffer Tube kit is perfect for those who either already have their own stock, are building a stripped lower, or converting from a rifle (fixed) stock. It contains everything needed to install Mil-Spec stocks from Magpul, BCM, MFT, Luth-AR, and many others. Includes(1) 7075-T6 Aluminum Mil-Spec 6-pos Buffer Tube Matte Black Anodized(1) Carbine Stock Lock Ring-Castle Nut(1) Carbine stock end plate