Ar-15 Fastback Receiver Extension - Ar-15 Fastback Receiver Extension Mil-Spec

Thanks to CMMG's unique Fastback Receiver Extension, you can now instantly deploy your stock or stabilizing brace to the exact position you need it from its collapsed position. Designed to accept all mil-spec buffer tubes, the Personal Position Preset system gives you several different lengths to choose from. All you have to do is set the indexing screw into the hole of your choice to set your preferred length. Once it's adjusted, simply pull the brace or stock to the rear, and the Fastback Rece