Rock River Arms Completed Upper Receiver Coyote Carbine .223/5.56mm 16 Inch Barrel 1/2-28 Thread Free-Float Handguard Vortex Flash Hider Black. 223/5.56mm Completed Upper. These AR15 Upper Receivers from the professional product specialists at Rock River Arms are fashioned working with heavy duty and reliable resources to be able to supply you with a product which will be useful for a long time. Manufactured using some of the very best attainable substances and design these special AR15 Upper Receivers from the product experts at Rock River Arms will last you an incredibly lengthy time. Rock River Arms has been making high quality products for a very long time and the Rock River Arms Coyote Carbine .223/5.56mm Completed Upper is their way of revealing just how much they care. At OpticsPlanet we make it our obligation to get the perfect solution for all of your needs and exhibiting the Rock River Arms Coyote Carbine .223/5.56mm Completed Upper is a thing that we're happy to offer. Specifications for Rock River Arms Coyote Carbine .223/5.56mm Completed Upper: Manufacturer: Rock River Arms Caliber: .223 Wylde 5.56mm Overall Length: 24 in Barrel Length: 16 in Barrel Profile: Carbine Gas System Length: Carbine Length Threads per Inch: 1/2x28 Handguard Type: Free-Float Muzzle Device: Vortex Flash Hider Finish: Anadized Color: Black Gas Block Journal Size-Diameter: .750 in Handguard Length: 12.5 in Gun Rail: Full Top Rail Weight: 4.4 lb Barrel Material: Chrome Moly Bolt Carrier Group Included: COM-SPEC Magazine Included: No Mount Type: M-LOK Package Contents: Rock River Arms Coyote Carbine .223/5.56mm Completed Upper Bolt Carrier Group Charging Handle Assembly Rock River Arms AR0592: Completed Upper Receiver Coyote Carbine .223/5.56mm 16 Inch Barrel 1/2-28 Thread Free-Float Handguard Vortex Flash Hider Black