Faxon 12.5" Medium Taper 5.56 NATO 4150 Chrome Lined Mag Phosphate Carbine-Length Barrel

Faxon 12.5″ Medium Taper 5.56 NATO 4150 Chrome Lined Mag Phosphate Carbine-Length Barrel

The Faxon 12.5″ Medium Taper 5.56 NATO 4150 Chrome Lined Mag Phosphate Carbine-Length Barrel offers a refined balance of durability, accuracy, and handling for builders who demand uncompromising performance in a compact AR-15 platform. Constructed from 4150 CMV steel and machined in-house by Faxon, this barrel features a medium taper profile that delivers increased rigidity and thermal control without unnecessary front-end weight. This makes it ideal for hard-use builds where both accuracy and rapid maneuverability are critical.

Chambered in 5.56 NATO, this barrel supports both 5.56 and .223 Remington ammunition, allowing for flexibility with a wide range of bullet weights. The button rifled bore has a 1:7 twist rate, optimized to stabilize heavier bullets such as 62-grain and 77-grain loads, giving shooters superior performance with match-grade or defensive ammunition. Inside, the bore and chamber are chrome lined to resist corrosion and erosion from high-volume fire, while the exterior is finished with manganese phosphate to reduce glare and increase surface protection in harsh conditions.

The carbine-length gas system provides dependable cycling in all environments, making it compatible with both suppressed and unsuppressed configurations. A .750″ gas block journal and 1.9″ journal length ensure compatibility with most low-profile gas blocks. The 1/2×28 TPI muzzle thread supports a wide variety of brakes, flash hiders, and suppressors, giving builders maximum customization potential. The M4 barrel extension provides secure, consistent lockup with standard AR-15 receivers, enhancing overall system reliability and accuracy.

At approximately 1.49 lbs, this barrel offers the right mix of strength and maneuverability. A recessed 11-degree target crown ensures consistent gas exit and improved shot precision, while magnetic particle inspection confirms structural integrity and quality.