Combat Armory AR-15 Stripped Upper Receiver Features The Combat Armory AR-15 Stripped Upper Receiver is machined from a solid billet of 7075 T6 aluminum a material chosen for its strength-to-weight ratio in high-stress firearm applications. Built to Mil-Spec dimensional tolerances this upper is designed to mate cleanly with standard Mil-Spec lower receivers and components without requiring extra fitting. M4 feed ramps are machined directly into the receiver helping ensure reliable cycling once a barrel bolt carrier group and other components are installed. This attention to dimensional accuracy reflects Combat Armory s background serving military police and firearms enthusiast customers. A hard anodized black finish coats the receiver providing resistance to the wear scratching and corrosion that come with regular use and handling during a build or at the range. This stripped upper supports multiple calibers across the AR-15 platform giving builders flexibility to pair it with a barrel and bolt in the chambering of their choice. As a stripped upper it ships without a barrel bolt carrier group or charging handle leaving those component choices entirely in the builder s hands. For AR-15 builders seeking a Mil-Spec billet upper receiver as the foundation of a custom rifle the Combat Armory stripped upper is available for sale at GrabAGun. Combat Armory AR-15 Stripped Upper Receiver Specifications Manufacturer: Combat Armory Model: AR-15 Upper Receiver Upper Type: Stripped Material: 7075 Aluminum Billet Finish: Hard Anodized Color: Black Compliance Pattern: AR-15 Features: M4 Feed Ramps Multi-Caliber Compatible Available At: GrabAGun