One Horse Ar15 Complete Upper 10.5in 300Aac. 5" 300aac. Developed working with several of the very most durable and dependable materials in existence these AR15 Upper Receivers through One Horse will present you with an item which will give many years of stability. One Horse has been making high quality merchandise for a very long time and the One Horse Ar15 Complete Upper 10.5" 300aac is their very own way of revealing how much they care. Right here at OpticsPlanet we ensure that it is our obligation to purchase the most suitable product for your needs and presenting the One Horse Ar15 Complete Upper 10.5" 300aac is a thing that we are happy to offer. Specifications for One Horse Ar15 Complete Upper 10.5" 300aac: Manufacturer: One Horse Caliber: .300 AAC Blackout Barrel Length: 10.5 in Finish: Matte Color: Black Fabric/Material: Steel Additional Features: 1-7in. Twist Package Contents: One Horse Ar15 Complete Upper 10.5" 300aac