CMMG, Receiver Extension Nut, Castle Nut for Buffer Tube, Fits AR-15, Matte Finish, Black
- Castle Nut for Buffer Tubes
- Fits AR-15
- Matte black finish
Since 2002 CMMG has been the leading manufacturer of AR-15 rifles, AR-10 rifles, and trailblazing AR technologies. CMMG offers premium AR-15 and AR-10 rifles, parts, and accessories.