Ballistic Advantage Modern Series 12.5″ 5.56 NATO Barrel

This 12.5 inch Ballistic Advantage Modern Series barrel is chambered in 5.56 NATO and built for AR-15 platforms requiring a compact, government-contour profile. It is machined from 4150 Chrome Moly Vanadium steel and finished with a QPQ corrosion-resistant coating. The barrel features a carbine-length gas system, a 1:7 twist rate, and a 1/2-28 threaded muzzle for common muzzle devices.

All NFA/ATF rules apply: this barrel may be used with a lower receiver that is a registered SBR, machine gun, or pistol. Possession of this barrel together with a non-NFA lower receiver is prohibited except when installed in a pistol configuration.

Key Specifications

• The barrel length is 12.5 inches.
• The chamber/cartridge is 5.56 NATO (.223 REM/5.56 NATO).
• The barrel is machined from 4150 Chrome Moly Vanadium steel.
• The exterior finish is QPQ (black).
• The rifling twist rate is 1:7.
• The contour/profile is Government.
• The gas system length is Carbine.
• The muzzle is threaded 1/2-28.
• The barrel weight is 22 oz.
• The barrel features are Threaded and include a QPQ-coated M4 feed ramp extension.

Compact and durable, this Modern Series 12.5″ barrel delivers a reliable platform for building a short-barrel AR configuration with predictable handling and traditional government contour. Its 1:7 twist and 5.56 NATO chambering suit a wide range of modern ammunition, while the QPQ finish and 4150 CMV construction offer corrosion resistance and longevity. Whether building a compact carbine or a pistol-caliber AR variant (observing all applicable NFA regulations), this barrel provides a precise, serviceable foundation for a quality AR-15 build.