CMMG Fastback Receiver Extension Mil-Spec 101119 Superior Comfort and Flexibility: The

Superior Comfort and Flexibility: The stretch feature allows for unrestricted movement

allowing you to customize your cheek weld for optimal alignment and precision

playful design makes it a fast favorite for kids and bubble lovers alike

Durable Material: Crafted from high-quality poly/wool blend

CMMG Fastback Receiver Extension Mil-Spec 101119 Superior Comfort and Flexibility: TheDeploy your favorite stock (or brace) faster than ever. The Fastback Receiver Extension attaches to any firearm that accepts a Mil Spec receiver extension (buffer tube). Once installed, this allows you to easily pull the stock (or brace) back to an extended position, without pressing a release button.