Rock River Arms Completed Upper Receiver National Match A4 .223/5.56mm 20 Inch Barrel 1-8 Twist 1/2-28 Thread Free-Float Handguard A2 Flash Hider. 223 Wylde Completed Upper then you've found yourself in the absolute right spot.. These AR15 Upper Receivers through the expert product professionals at Rock River Arms are made using long lasting and efficient components in order to provide you with product that is going to be beneficial for countless years. Made utilizing some of the very best accessible components and construction these AR15 Upper Receivers through the product experts at Rock River Arms will last an incredibly long time. Rock River Arms has been generating top quality products for a number of years and the Rock River Arms National Match A4 .223 Wylde Completed Upper is their very own approach to showing you just how much they are concerned. At OpticsPlanet we make it our obligation to purchase the best solution for all of your requirements and exhibiting the Rock River Arms National Match A4 .223 Wylde Completed Upper is something that we're pleased to offer. Specifications for Rock River Arms National Match A4 .223 Wylde Completed Upper: Manufacturer: Rock River Arms Caliber: .223 Wylde 5.56mm Overall Length: 28 in Barrel Length: 20 in Barrel Profile: Heavy Gas System Length: Mid Length Barrel Twist Rate: 1-8 Threads per Inch: 1/2x28 Handguard Type: Free-Float Muzzle Device: A2 Flash Hider Finish: Anadized Color: Black Gas Block Journal Size-Diameter: .750 in Handguard Length: 15 in Weight: 7.13 lb Barrel Material: 416R Stainless Steel Bolt Carrier Group Included: COM-SPEC Magazine Included: No Package Contents: Rock River Arms National Match A4 .223 Wylde Completed Upper Bolt Carrier Group Charging Handle Assembly Rock River Arms AR0798: Completed Upper Receiver National Match A4 .223/5.56mm 20 Inch Barrel 1-8 Twist 1/2-28 Thread Free-Float Handguard A2 Flash Hider w/Gas Block Black