One Horse OH-15 A3 Stripped Upper Features The One Horse OH-15 A3 Stripped Upper is precision machined from 7075-T6 aluminum delivering the superior strength-to-weight ratio dimensional accuracy and long-term durability that serious AR-15 builders demand from a foundation upper component. The A3 flat-top configuration features a full-length Picatinny rail that provides seamless and standardized optics and accessory mounting across the entire top surface without the need for additional adapters or mounts. The black finish provides corrosion resistance and a clean professional appearance that pairs naturally with a wide range of barrel handguard and lower component finishes. The stripped format gives builders complete freedom to select every barrel assembly bolt carrier group charging handle and handguard to their exact specifications enabling a fully customized upper tailored to a specific caliber role or shooting application. Multi-caliber compatibility opens the door to a wide range of barrel pairings from 5.56 NATO and .300 Blackout to 6mm ARC and beyond making the OH-15 A3 Stripped Upper one of the most versatile upper foundations available for any AR-15 build. The 7075-T6 aluminum construction provides the structural integrity needed to handle the sustained stress of high-volume shooting across decades of use. Designed for AR-15 builders who want the highest level of customization and control over their upper build from the ground up the One Horse OH-15 A3 Stripped Upper reflects One Horse s commitment to delivering quality mil-spec components at an accessible price point. Whether building a dedicated precision rifle a compact pistol or a versatile home defense carbine the OH-15 A3 Stripped Upper provides the solid and dependable foundation that every serious AR-15 upper build deserves. For builders who refuse to compromise on material quality or dimensional accuracy the OH-15 A3 Stripped Upper is the definitive starting point. One Horse OH-15 A3 Stripped Upper Specifications Manufacturer: One Horse Model: OH-15 A3 Stripped Upper Caliber Compatibility: Multi Material: 7075-T6 Aluminum Configuration: A3 Flat-Top Finish: Black