If you're ready to take your next custom AR15, M16 or M4 build up a notch with improved performance and durability, reach for the Wilson Combat Retro-Fit Kit. Constructed out of 7075 T6 aluminum with an Anodized finish per Mil-A-8625F Type III Class 2 specifications that surpasses industry standards - this buffer tube is exactly what you've been searching for! Compatible stocks include USGI, BCM, Colt LMT SOPMOD VLTOR Stag Arms Magpul CTR (Milspec) models that are made to Mil-Spec size. Enjoy the confidence that comes with knowing you have the highest quality parts and gear on your custom build. Get your Wilson Combat Retro-Fit Kit today and start building! Kit Includes:Receiver ExtensionReceiver end plate Receiver castle nutStandard carbine bufferCarbine buffer spring