CMMG Receiver Extension Mk4 provides a reliable buffer tube solution for AR-platform rifles. Engineered for durability and precision fit with standard AR components.
The CMMG Receiver Extension Mk4 is a precision-engineered buffer tube designed for AR-platform rifles. This component serves as the backbone of your rifle's recoil management system, housing the buffer spring and buffer weight that work together to control bolt carrier group movement.
The receiver extension is a critical part of your rifle's function. It houses your recoil system and provides the mounting point for your stock. A quality receiver extension ensures smooth operation and longevity of your rifle.
Whether you're building a new AR or upgrading an existing rifle, the CMMG Receiver Extension Mk4 delivers the reliability and precision you expect from a quality manufacturer.