One Horse 10.5″ Complete Upper | 5.56 NATO | BCG & Charging Handle

The One Horse Complete Upper Receiver is a factory-assembled AR-15 upper built around a 10.5-inch medium-contour barrel chambered for .223 Rem / 5.56 NATO. It ships with a nitride-finished bolt carrier group and a standard charging handle, and is fitted with a 10-inch M-LOK handguard for accessory mounting. The barrel uses a 1:7 twist and a pistol gas system to suit short-barrel configurations and a broad range of projectiles. This upper is appropriate for pistol and short-barreled rifle (SBR) builds and for close-range training or competition work.

Product Specifications

• The cartridge is .223 Rem / 5.56 NATO.
• The barrel length is 10.5 inches.
• The barrel contour is Medium.
• The muzzle threads are 1/2-28.
• The twist rate is 1:7.
• The gas system is Pistol.
• The barrel material is 4150.
• The handguard length is 10 inches and uses an M-LOK interface.
• The bolt carrier group is nitride-finished.
• The charging handle is Standard.
• The exterior finish is Matte.
• The manufacturer is One Horse.
• The model designation is Complete Upper Receiver 5.56 NATO 10.5 inches.
• The UPC is 850078799296.

Compact and modular, this One Horse upper provides a straightforward foundation for specialized AR builds. The M-LOK handguard keeps accessory options flexible while nitride-treated components reduce routine maintenance. For builders seeking a ready-to-install short-barrel upper that balances durability and adaptability, this unit is a practical, no-nonsense choice.