Description Upgrade your firearm with the Ballistic Advantage 9″ .300 AAC Blackout Barrel. This Modern Series Barrel is expertly machined from durable 4150 Chrome Moly Vanadium steel and features a QPQ Corrosion Resistant Finish along with a QPQ coated M4 feed ramp extension. Designed for versatility, it is compatible with registered SBRs, machine guns, or pistols. Ensure compliance with NFA/ATF rules when using this barrel. Elevate your shooting experience with precision and reliability.