Ballistic Advantage 13.7″ 5.56 Government Profile Midlength AR-15 Barrel Modern Series 1:7 Twist

The 13.7″ Government profile mid-length barrel chambered in 5.56 is machined from premium 4150 Chrome Moly Vanadium steel and finished with a QPQ corrosion-resistant treatment to resist wear and corrosion under heavy use. The government contour provides a durable, familiar profile while keeping weight reasonable for carbine and compact builds. With a 1:7″ twist rate, this barrel stabilizes a wide range of projectile weights — particularly heavier match and barrier-penetrating bullets — making it a versatile choice for duty, competition, or precision AR builds.

Engineered around a mid-length gas system for a smoother gas impulse and enhanced reliability, the barrel includes a QPQ coated M4 feed ramp extension for consistent chambering and a .750″ gas block journal for standard gas block compatibility. The muzzle is threaded 1/2×28 for common muzzle devices and suppressor mounts. Buy now at AR-15 Discounts.

Specifications

• Caliber: 5.56 NATO / .223 Rem compatible (standard 5.56 chamber)

• Length: 13.7″

• Material: 4150 Chrome Moly Vanadium (CMV)

• Profile: Government

• Finish: QPQ Corrosion Resistant

• Twist Rate: 1:7″ (one turn in 7 inches)

• Gas System Length: Mid-Length

• Gas Block Journal: .750″

• Muzzle: 1/2×28 threaded