| Caliber | 5.56x45mm |
| Barrel Length | 12.5 |
| Barrel Twist | 1:7 |
| Barrel Contour | Multi Role |
| Barrel Material | 4140CM |
| Barrel Twist | 1:7 |
| Muzzle Thread | 1/2 X 28 |
| Gas Port Location | Carbine |
| Gas Block | 0.750" |
| Weight | 1.5 lbs |
Due to high demand and supply chain issues affecting many industries, some of our parts and accessories may be on backorder and have an extended lead time. Items currently on backorder can still be purchased and can typically be shipped within 25 business days.
Barrel Sub-Assm, 12.5" MR 4140CM SBN, 5.56mm
Perfect for building your custom AR15 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.
**All NFA rules apply** See linked CMMG Resource article for more information.
All CMMG products come with our Lifetime Quality Guarantee.