| Platform | Mk3 |
| Caliber | .308 WIN |
| Barrel Length | 12.5 |
| Barrel Twist | 1:10 |
| Barrel Contour | MT |
| Barrel Material | 4140CM |
| Barrel Twist | 1:10 |
| Muzzle Thread | 5/8 X 24 |
| Gas Port Location | Mid |
| Gas Block | 0.750" |
| Finish | SBN |
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.
Barrel Sub-Assm, 12.5" MC 4140CM SBN, 308 Win
Perfect for building your custom Mk3/High Pattern LR-308 upper group. Comes with a properly installed barrel extension. All barrel sub-assemblies are properly headspaced and comes with CMMG's Lifetime Quality Guarantee.
**All NFA rules apply** See linked CMMG Resource article for more information.