The Diamondback Firearms 18-Inch AR-15 Threaded Barrel (brand part number DB223WM18M50B7-R) is chambered in .223 Wylde, a hybrid chamber cut that runs both .223 Remington and 5.56 NATO ammunition safely while holding tighter accuracy than a mil-spec 5.56 chamber. Diamondback machines the barrel from 4150 chrome-moly vanadium steel for heat resistance and long service life, then cuts a 1:7-inch twist rate that stabilizes the heavier bullet weights favored for longer-range shooting. The mid-length gas system times the AR-15’s gas impulse for a smoother, softer cycling feel than a carbine-length setup, and the muzzle is threaded to accept a compensator, brake, or suppressor mount. It’s built for a shooter who wants barrel-level accuracy and reliability on a custom or replacement AR-15 upper.

Key Specifications

• Chambered in .223 Wylde, safely running both .223 Remington and 5.56 NATO.
• Measures 18 inches in barrel length.
• Cut with a 1:7-inch twist rate for stabilizing heavier bullet weights.
• Built with a mid-length gas system for smoother, softer cycling.
• Machined from 4150 chrome-moly vanadium steel for heat resistance and durability.
• Muzzle is threaded to accept a compensator, brake, or suppressor mount.
• Engineered for enhanced corrosion resistance and heat dissipation under sustained fire.
• Machined for consistent, shot-to-shot precision across sustained strings of fire.
• Suited to both professional/duty use and recreational range shooting.

Frequently Asked Questions

Can this barrel run both .223 and 5.56? Yes, the .223 Wylde chamber is designed to safely run both cartridges.

What gas system length does it use? Mid-length, which times the gas impulse for smoother cycling than a carbine-length system.

Is the muzzle threaded? Yes, it’s threaded to accept a compensator, muzzle brake, or suppressor mount.

Buy the Diamondback Firearms 18-Inch AR-15 Threaded Barrel – .223 Wylde, 1:7 Twist, Mid-Length

Build or rebarrel your AR-15 with a precision-cut, heat-treated barrel. Order it from our Diamondback Firearms lineup, part of our AR barrels selection, from our Lubbock, Texas gun shop as soon as it’s ready to ship.