ASK AN EXPERTDescription
- Fits AR-15/MK4 Carbine Receiver Extension Tube
- Matte Black Finish
The CMMG MK4 Receiver Extension Nut is made for use on the AR-15/MK4 platform. CMMG produces high quality parts and accessories for a variety of weapons platforms. You can always rely on CMMG for parts which are correct and within specification.
