CMMG Mil-Spec AR-15 Buffer Tube Kit Aluminum Black

Combine this CMMG Receiver Extension Buffer Tube Assembly with your choice of lower parts kit and butt stock to complete your new lower group. The CMMG Receiver Extension attaches to any firearm that accepts a Mil-Spec receiver extension (buffer tube). Includes:CMMG 6 Pos Receiver ExtensionCarbine Buffer AssemblyCarbine Action Spring FeaturesMil-Spec DiameterAluminumHard Coat Anodized Finish