Brownells 75th Anniversary - A Shooting Heritage

The Perfect Barrel for Your Next Pistol-Caliber Carbine

The Brownells 10mm Auto AR-15 barrel allows fans of the powerhouse 10mm cartridge to built an AR-style carbine or pistol chambered in their favorite pistol round, enhancing its usability with a new platform.

The Brownells 10mm Auto AR-15 barrel is machined from triple stress-relieved 4150 steel, which features a nitride coating for added strength. Each barrel comes equipped with 360-degree feed ramps and a hand-polished chamber that ensures reliable extraction.

  • Features 1:16 rate of twist
  • Designed to work with any blowback .40 S&W bolt-carrier group
  • Features 11-degree target crown
  • Includes threaded muzzle with 5/8x24 TPI thread pitch

The Brownells 10mm Auto AR-15 barrel is completely made in the USA and will require the use of an extra-heavy AR buffer for reliable operation.


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Cartridge: 10 mm Auto

Length: 10.5"

Finish: Black

Muzzle Threads: 5/8-24

Twist: 1-16