The Faxon Firearms Duty Series AR-15 .300 Blackout 1:8 4150 CMV Barrel is designed for dependable accuracy and lasting durability, whether for duty use, home defense, or competition. Crafted from 4150 Chrome Moly Vanadium steel and finished with a QPQ Nitride treatment, this barrel offers superior corrosion and wear resistance. Precision-machined button rifling with a 1:8 twist rate provides exceptional accuracy and consistent service with most .300 Blackout bullet weights. Machined 1/2x28 threads readily accept a variety of compensators, flash hiders, and suppressor adapters. An 11° target crown improves shot consistency and accuracy, while Magnetic Particle Inspection (MPI) verifies material integrity for safe, reliable performance. Compatible with most Mil-Spec AR-15 platforms.