CMMG MK4 Black Steel AR Receiver Extension

Upgrade your AR platform with the CMMG MK4 Black Steel AR Receiver Extension. This buffer tube, with part number 55CA9D7, is crafted from durable black steel, offering superior performance and a reliable fit for your MK4 setup. Weighing just 0.25 pounds, it perfectly balances strength and lightweight construction. Trust CMMG's reputation for quality and precision with this essential AR accessory.