One Horse Ar15 Complete Upper 10.5in 5.56 Nato. 5" 5.56 Nato. Established using some of the most extremely sturdy and long lasting components in existence these AR15 Upper Receivers through One Horse offers you an item which gives you numerous years of consistency. One Horse has been making high-quality products for a number of years and the One Horse Ar15 Complete Upper 10.5" 5.56 Nato is their particular way of revealing just how much they care. Here at OpticsPlanet we ensure that it is our obligation to purchase the best solution for all of your needs and featuring the One Horse Ar15 Complete Upper 10.5" 5.56 Nato is something that we're delighted to offer. Specifications for One Horse Ar15 Complete Upper 10.5" 5.56 Nato: Manufacturer: One Horse Caliber: .223 Remington Barrel Length: 16 in Finish: Matte Color: Black Additional Features: 1-7in. Twist Package Contents: One Horse Ar15 Complete Upper 10.5" 5.56 Nato