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Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced. - 18 - Medium Taper Profile - 416 Stainless Steel - Bead Blasted Finish - 1:7 Twist - 5.56
| Manufacturer | CMMG |
| UPC | 815835016184 |
| SKU | 55D660A |
| Width | 1.8000 |
| Length | 21.1500 |
| Height | 1.7500 |
| Weight | 3.0000 |



FFL Required