Next Level Armament AR-10 .308 Caliber Upper Receiver Left Hand Black. Precision machined to exact tolerances you wont find a better platform for your AR10 rifle. Specifications for Next Level Armament AR-10 .308 Caliber Upper Receiver: Manufacturer: Next Level Armament Color: Black Fabric/Material: Billet Aluminum Caliber: .308 Winchester Gun Model: AR-10 Package Contents: Next Level Armament AR-10 .308 Caliber Upper Receiver What firearm models does the manufacturer say Next Level Armament AR-10 .308 Caliber Upper Receiver is compatible with? The manufacturer suggests that Next Level Armament AR-10 .308 Caliber Upper Receiver is compatible with AR-10Next Level Armament ASC220: AR-10 .308 Caliber Upper Receiver Left Hand Black