One Horse OH-CU03 | 7.5″ 5.56 NATO Complete Upper

This One Horse OH-CU03 is a factory complete upper assembly for AR-15 platform builds. It features a 7.5″ medium-contour barrel finished in matte black and is chambered for .223 Rem/5.56 NATO with a 1:7 rate of twist. The assembly includes a 5/8-24 threaded muzzle and is configured to support compact pistol-style AR builds and close-range training or target use.

Product Specifications

• The product is a Complete upper assembly ready for installation on an AR-15 lower.
• The barrel length measures 7.5″ for a compact, pistol-style profile.
• The cartridge is listed as .223 REM/5.56 NATO.
• The rate of twist is 1-7.
• The muzzle threads are 5/8-24.
• The make/model is specified as AR-15.
• The external color is Black.
• The barrel contour is Medium.
• The external finish is Matte.
• The style is identified as Complete (upper assembly).
• The manufacturer is listed as One Horse.
• The manufacturer part number is OH-CU03.
• This upper is intended for use on AR-15 platform lowers.
• The unit UPC is 850078799302.

The OH-CU03 upper brings a compact, purpose-driven configuration to an AR-15 build. Its 7.5″ medium-contour barrel and 1:7 twist provide a balance of stabilization for common 5.56 loads while keeping the overall profile compact for pistol-style builds and close-range training. The matte finish and standard 5/8-24 muzzle threads make it a straightforward option for builders seeking a durable, ready-to-install complete upper.