Cmmg Receiver Extension Mk4

The CMMG Receiver Extension Mk4 is a carbine-length buffer tube specifically designed for use with AR-15 platform rifles and carbines. This receiver extension plays a crucial role in recoil management, ensuring reliable performance across military, law enforcement, and civilian applications.

Constructed from aircraft-grade aluminum and finished with a hard-coat anodized matte black coating, the Mk4 is engineered for durability and corrosion resistance. Its design optimizes compact handling while maintaining necessary rigidity for consistent cycling, making it suitable for high-round-count training and duty use.

This receiver extension is compatible with standard AR-15 lower receivers and is ideal for builders focused on reliability and modularity. Whether for a duty rifle, patrol carbine, or competition setup, it excels in close-quarters scenarios where overall length is a consideration.