Lead & Steel .300 Blackout 16-Inch AR-15 Barrel, Government Profile

The Lead & Steel .300 Blackout 16-inch AR-15 Barrel (Lead & Steel part no. LS300-16) is a purpose-built replacement barrel for shooters running the .300 AAC Blackout cartridge on a standard mil-spec AR-15 upper. Machined from 4150 chrome moly vanadium steel and finished in a QPQ black nitride coating, it is built to shrug off sustained range use and hard-use duty without flaking or corroding. The 16-inch length paired with a 1:7 twist rate stabilizes the full range of .300 Blackout bullet weights, from lightweight supersonic loads up to heavy subsonic rounds. Cut with a government profile for added rigidity and heat dissipation, this barrel is a smart upgrade for hunters, home-defense shooters, and range enthusiasts building or refreshing an AR-15 platform rifle.

Key Specifications

• Chambered for .300 AAC Blackout, giving supersonic and subsonic loads a dedicated, correctly-headspaced barrel.
• Built for the AR-15 platform, dropping into any standard mil-spec .300 Blackout upper without modification.
• Machined to a 16-inch length, balancing velocity retention with a maneuverable overall rifle length.
• Cut with a 1:7 rate of twist, stabilizing heavier subsonic bullet weights alongside standard supersonic loads.
• Forged from 4150 chrome moly vanadium steel for strength and heat resistance under sustained fire.
• Finished in QPQ black nitride, a corrosion- and wear-resistant coating that outlasts standard bluing.
• Machined with a government profile contour for added barrel rigidity and heat dissipation.
• Shares the 5.56/.223 bolt face of the .300 Blackout cartridge, so it runs on a standard AR-15 bolt rather than a 9mm blowback bolt.
• Feeds from standard AR-15/M4 magazines, so no dedicated 9mm or AR9 magazine is required.

Frequently Asked Questions

Is this barrel compatible with AR9 or other 9mm AR builds? No, this is a .300 AAC Blackout barrel built for standard AR-15 upper receivers and bolts, not a 9mm AR9 blowback platform.

What twist rate does this barrel use? It is cut with a 1:7 twist, which stabilizes both lightweight supersonic and heavier subsonic .300 Blackout loads.

What finish protects the barrel? A QPQ black nitride finish that resists corrosion and wear better than traditional bluing.

Buy the Lead & Steel .300 Blackout 16-Inch AR-15 Barrel, Government Profile

Whether you are finishing a fresh .300 Blackout build or replacing a worn factory barrel, this Lead & Steel barrel delivers accurate, mil-spec performance without the guesswork. Order it today from our AR barrels selection and Schaefer Defense will ship it fast, direct to your door from our Lubbock, Texas gun shop.