ATI ATI15MS556ML15 5.56x45mm 16" Black Nitride Barrel

The ATI ATI15MS556ML15 5.56x45mm 16" Black Nitride Barrel is purpose-built for AR-platform rifles that demand reliable, combat-proven performance. Whether you're assembling a patrol carbine, home defense system, or precision shooting platform, this barrel from American Tactical Inc delivers the ballistic consistency and durability required in high-stress operational environments.

The 16-inch length strikes the optimal balance between velocity retention, maneuverability in confined spaces, and sight radius. Machined to exacting tolerances and finished in Black Nitride, this barrel resists corrosion, erosion, and fouling far more effectively than standard mil-spec parkerization or bare steel. The Black Nitride treatment penetrates the bore surface, creating a harder, more durable wear surface that extends component lifespan under rapid-fire conditions and reduces bore cleaning frequency.

The 5.56x45mm chambering ensures NATO-standard compatibility across factory ammunition, military surplus rounds, and match-grade handloads, making logistics straightforward in the field. Designed for drop-in installation on standard AR-15 upper receivers, the barrel requires only proper headspacing verification and torque to specification during assembly. Law enforcement departments, military armorers, and civilian shooters building or upgrading AR platforms will find this barrel delivers authentic mil-spec quality.