V Seven Harbinger 308 Upper Receiver HARB UR-ALU. 308 platform rifles with a collapsible-stock compact upper receiver. Easy installation of the Harbinger will allow you to make the most of todays advanced pistol calibers. Built around a quality 7075 T6 aluminum material the Harbinger upper will provide years of excellent use. Also a value-added item that requires no gunsmithing installation or disassembly and can be installed in minutes. Simply remove the safety insert the magazine release and reinsert into the upper. Your only choice for a great shooting experience is the Harbinger yourself. Specifications for V Seven AR-10 308 Harbinger Upper Receiver: Manufacturer: V Seven Caliber: .308 Winchester Finish: Anodized Color: Black Weight: 10.8 oz Condition: New Magazine Included: No Projectile Caliber: .308 Caliber Features: Billet 7075 T6 Aluminum (Dpms/Sr25Type)Upper Package Contents: V Seven Harbinger Upper Receiver V Seven HARB UR-ALU: Harbinger 308 Upper Receiver