CMMG 55CA9D7 Receiver Extension MK4 Black Steel AR Platform


The CMMG 55CA9D7 Receiver Extension is a sturdy, black steel addition designed for the MK4 platform. Enhance your firearm’s performance with this durable component.


Optimize your firearm with the CMMG 55CA9D7 Receiver Extension. Specifically designed for the MK4, this receiver extension is an ideal addition for enhancing your firearm’s performance.

Material and Design

Crafted from durable black steel, this receiver extension promises long-lasting performance. Its robust construction can withstand heavy usage, ensuring optimal operation over time.


The CMMG 55CA9D7 Receiver Extension is tailored to the MK4 platform. Its perfect fit and design allow for a seamless integration with your existing setup.

Additional information


Go to Top