Ar-15 Modern Series 5.5 Barrel

The AR-15 Modern Series 5.5 Barrel by Ballistic Advantage is a precision-engineered barrel designed for shooters who demand accuracy and reliability in a compact platform. This 5.5-inch barrel strikes the ideal balance between maneuverability and velocity retention, making it a go-to choice for tactical operators, law enforcement, and precision-focused civilians building short-barreled rifles (SBRs). Whether you're configuring a home-defense rig, a duty carbine, or a precision-shooting platform, this barrel delivers the performance characteristics required for professional-grade applications.

Ballistic Advantage has engineered this barrel with premium 4150 chrome-moly steel, featuring precision button-rifling for consistent shot-to-shot accuracy. The Modern Series designation reflects contemporary design standards: tight tolerances ensure reliable chambering across quality ammunition, while the streamlined profile reduces unnecessary weight—critical in short-barrel configurations where every ounce impacts handling dynamics and muzzle control. At 0.62 lbs, this barrel contributes minimal mass to your upper receiver, enabling faster target transitions and reduced fatigue during extended shooting sessions. The 5.5-inch length optimizes the velocity-accuracy window for 9mm and intermediate cartridges, maximizing energy downrange without sacrificing the compact footprint that operators demand.

This barrel is purpose-built for AR-15 platforms with standard 0.625-inch diameter extensions and mil-spec threading. Installation requires a barrel wrench and action block; headspacing verification is mandatory before live fire. Law enforcement agencies and military units frequently specify Ballistic Advantage barrels for duty carbines because the precision manufacturing reduces point-of-impact shift over thousands of rounds—a critical reliability factor in high-stakes environments. Civilian builders appreciate the same quality for competition, training, and home defense applications where consistent accuracy directly impacts safety and performance outcomes.