Dbb Bbl 556 16" Carb Med 1/9 Blk

The Diamondback 5.56 16-inch carbine barrel is a reliable, mid-profile build component for AR-15 platforms. Chambered in 5.56 NATO with a 1:9 twist rate, this barrel balances accuracy and handling in a compact length suited to close-quarters and intermediate-range shooting. The nitride finish delivers corrosion resistance and durability for hunters, sport shooters, and tactical builders who demand dependable performance without paying for unnecessary frills.

Diamondback has built a reputation since 1989 on no-compromise engineering across AR-15 and defensive platforms. This barrel reflects that philosophy: straightforward, proven geometry without marketing hype. The 16-inch length keeps your overall rifle length manageable while maintaining sight radius and velocity adequate for 5.56 duty. Whether you're building a patrol rifle, a hunting carbine, or a recreational plinker, this barrel integrates seamlessly into standard AR-15 upper receiver assemblies.

The medium profile strikes a practical middle ground between lightweight pencil barrels and heavier match-grade profiles, making it an excellent choice for shooters who want durability and reasonable weight in a workhorse barrel. The nitride treatment hardens the steel surface, resisting wear and corrosion without the brittleness that can accompany case hardening. This is a no-nonsense component for builders who prioritize reliability and longevity over exotic finishes or premium pricing.

Key Features

• 5.56 NATO chamber for standard rifle ammunition and components
• 16-inch carbine length for compact, maneuverable builds
• 1:9 twist rate optimized for standard 5.56 projectile weights
• Medium profile for balanced handling and durability
• Nitride finish resists corrosion and wear
• Direct drop-in fit for standard AR-15 upper receivers

Specifications

Frequently Asked Questions

Will this barrel fit my AR-15 upper receiver?

Yes. This is a standard AR-15 barrel with conventional threading and profile, designed for direct installation into any mil-spec or commercial upper receiver.

What twist rate is best for 5.56?

The 1:9 twist rate is a proven standard for 5.56 NATO, stabilizing rounds across the typical weight range (55–77 grains). It's an ideal all-around choice for general shooting, hunting, and duty use.

Is a 16-inch barrel legal?

A 16-inch barrel keeps your rifle above the federal minimum barrel length and avoids NFA regulation in most jurisdictions. Always verify local and state firearm laws before completing any build.

Why choose a medium profile barrel?

Medium profile barrels balance weight, heat capacity, and durability. They're lighter than heavy profiles for carry and handling, yet more robust than pencil barrels for sustained or rapid fire.