.300 Blackout Barrels for AR-15s

Looking for a new, match-grade barrel for your .300 BLK AR-15? WMD Guns carries several options ready for subsonic or supersonic applications. Check out our .300 Blackout barrels for sale to find the perfect model.

Our .300 Blackout Barrel Options

The .300 AAC Blackout, also known as the .300 BLK or the 7.62×35 mm, is an unusual round that uses modified .223 Rem/5.56 NATO brass and holds a .30-caliber bullet. The cartridge combines lower velocity with impressive frontal area and stopping power, making it excellent for shorter-range shooting and use with a suppressor. 

A .300 BLK barrel is a great starting point for a pistol, a compact rifle or an SBR. With those features in mind, we offer barrel lengths including:

• 7.5”
• 10.5”
• 16”

Benefit From Long-Lasting Barrel Coatings

A firearm’s barrel has a lot to benefit from a performance finish. Many of our AR barrels for sale come with a Nitromet coating. This salt bath nitrocarburizing process yields a surface more resilient than hard chrome and boasting a 30% longer lifespan. 

Nitromet resists heat, chemical damage and pressure, making it an excellent choice for gun barrels. With our high-performance coatings, your .300 Blackout will be ready for anything. 

Shop Our Match-Grade .300 BLK Barrels for New AR Builds

The WMD Guns team is proud to offer an extensive range of U.S.-made firearm components. We’ve united chemistry, metallurgy and gunsmithing to build some of the best pieces on the market. Check out our gas system parts, magazines, bolt carrier groups and other selections to build or upgrade your AR and benefit from our decades of experience. 

Interested in something a little more special for your .300 Blackout? We’re happy to discuss custom designs. Reach out to our team to see what we can do for you.