One Horse ONE OH-CU04 | 16″ .300 AAC Blackout Upper

This One Horse ONE OH-CU04 is a factory-complete AR-15 upper built around a 16-inch Socom-contour barrel chambered for .300 AAC Blackout. It is finished in matte black and comes assembled to work with standard AR-15 lower receivers. The design combines a shorter, heavier-profile barrel with common muzzle threading for accessory compatibility and a 1:7 rate of twist optimized for heavier .300 AAC Blackout projectiles.

Common applications include suppressed shooting and close-range precision work or training where the .300 AAC Blackout cartridge and a Socom contour barrel are beneficial.

Product Specifications

• The UPC is 850078799319.
• The cartridge is .300 AAC Blackout.
• The barrel measures 16″ in length.
• The barrel contour is Socom.
• The finish is Matte.
• The product color is Black.
• The rate of twist is 1-7.
• The muzzle threading is 5/8-24.
• The unit ships as a Complete upper receiver assembly.
• The upper is built for AR-15 compatible lowers.

This ONE OH-CU04 upper offers a practical combination of a 16″ Socom-profile barrel and .300 AAC Blackout chambering for shooters seeking a factory-assembled, AR-15-compatible upper that accepts common accessories via 5/8-24 threading. Its 1:7 twist stabilizes heavier projectiles used in many .300 AAC Blackout applications, while the matte black finish keeps the visual presentation utilitarian and low-reflective.