CMMG AR-15 Fastback Receiver Extension

Compatible with any firearm platform that accepts Mil-Spec buffer tubes, the CMMG AR-15 Fastback Receiver Extension is the perfect addition to your custom rifle build. This extension features lightweight aluminum construction with a corrosion-resistant anodized finish for long-lasting strength and durability, while the smooth 6-position design allows you to make quick length of pull adjustments without pressing a release button for faster and smoother deployment. Includes a user-adjustable indexing screw for a custom and repeatable length of pull with each deployment.