The Ballistic Advantage AR-15 MODERN SERIES 13.7'' Mid-Length Government Barrel is engineered for reliable performance in duty, competition, and sport shooting, delivering a balanced blend of accuracy and durability in a compact profile. This 13.7-inch barrel is chambered in 5.56x45mm NATO and features a precise 1-7 twist rate to stabilize a wide range of common 5.56 projectiles, while the mid-length gas system provides smoother operation and reduced felt recoil compared to carbine-length configurations. The government contour pairs with a robust 25 oz weight to enhance rigidity and maintain muzzle stability, making it a natural choice for builds that demand consistent point-of-impact behavior and repeatable accuracy. Finished in a durable Black, the barrel's geometry supports reliable extraction and long service life, and the 1/2-28 muzzle threads accommodate a broad array of compensators, flash suppressors, or accessories. Designed for AR-15 compatibility, this modern series barrel integrates seamlessly with standard upper receivers and components, translating factory-level performance into customized rifle builds tailored to varmint control, target shooting, or personal defense applications.