Ar-15 10mm Auto Barrels 4150 Steel - 10mm Auto Barrel 10.5'''' 1-16 Twist 4150 Steel

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 Mfg: Brownells