Brownells has unveiled two new barrels for your next AR build; one is in .450 Bushmaster and the other is in .458 SOCOM. Brownells specifically requested these barrels from Faxon Firearms.

The .450 Bushmaster barrel boasts a button-rifled design. It’s machined from 4150 GBQ mil-spec steel. It also uses a .750-inch gas-block journal that works with a number of different aftermarket components. The barrel measures 16 inches in length with a 1:16 twist rate. It’s also threaded for use with suppressors. In addition, it’s machined with an 11-degree target crown and magnetic particle inspected.

The .458 SOCOM barrel boasts many of the same characteristics as its .450 Bushmaster counterpart. It’s constructed from 4150 GBQ mil-spec, bar-stock, stress-relieved and nitride-treated steel; it’s threaded for suppressors; and it has an 11-degree target crown. The barrel length on this one is also 16 inches. However, it features a 1:14 twist rate, and the gas block is .875 inches in diameter. This barrel is also button-rifled with traditional land-and-groove rifling, Brownells says.

Brownells ships both barrels out with a bolt and a removable 3-post muzzle brake. Lastly, MSRP on each model is $309. See the features and a video below. For even more info, go to

Brownells .450 Bushmaster AR-15 Barrel

  • Features 1:16 rate of twist
  • Threaded for suppressor use
  • Includes nitride coating for corrosion resistance
  • Machined with 11-degree target crown

Brownells .458 SOCOM AR-15 barrel

  • 1:14 rate of twist
  • Threaded muzzle for suppressor attachment
  • .875″ OD gas block
  • 11-degree target crown
  • Magnetic particle inspected

Up Next

Civil War Revolvers: The British Wheelguns Used in America’s Fight

The Union and Confederacy both turned to Great Britain in their time of need....