When every detail of your build matters look to a Alpha Tactical Stripped AR15 Upper Receiver to perfectly customize your firearm. These AR15 Upper Receivers feature M4 feed ramps that prevent jamming and overheating of the cartridge. With an anodize hardcoat the Radical Firearms Forged AR15 Upper Receiver is corrosive resistant and holds up to wear and tear. When you're on a budget but demand the best you need a Alpha Tactical Mil-Spec AR10 Upper Receiver.