| Platform | Mk3 |
| Buffer Type | .308 Carbine |
| Receiver Extension | CMMG 6 Position Extension |
| Stock / Brace | M4 |
AR Parts Notice - State/local restrictions may apply in CT, DC, IL, MA, NJ, NY, or WA. Customers must review our Shipping Policy prior to ordering.
Receiver Extension and Stock Kit, Carbine, Mk3
The CMMG® Mk3 Carbine Receiver Extension and M4 Stock Kit has all the essentials for your next AR lower build. The M4 buttstock is a proven lightweight design that is extremely durable. Combine this kit with your choice of Lower Parts Kit to complete your lower group.
All CMMG products are backed by our Lifetime Quality Guarantee.
Kit Includes:
- 6-position M4 Buttstock
- CMMG 6-position mil-spec Receiver Extension (Buffer Tube)
- Buffer Tube Castle Nut
- Receiver Endplate
- .308 Carbine Buffer
- .308 Carbine Action Spring