- Fits AR-15 Lower Receiver
- Carbine-Length Buffer Tube System
- Includes Receiver Extension, Castle Nut, and End Plate
- Mil-Spec Dimensions
- Color: Black
- MPN: 55CA6C7
The CMMG AR-15 Carbine Receiver Extension Kit includes all the components needed to install a carbine-length buffer tube system on an AR-15 lower receiver, including the receiver extension, castle nut, and end plate.