Shop › RRA CMP COYOTE CAR A4 UPR 300BLK 16" RRA CMP COYOTE CAR A4 UPR 300BLK 16" $820.00 Rock River Arms Coyote Carbine, Complete Upper Receiver, 300 Blackout, 16" Barrel, Smith Vortex Flash Hider, RRA 12.5" Free Float M-LOK Handguard, Anodized Finish, Black, Fits AR-15, Includes Bolt Carrier Group and Charging Handle Assembly BLK0592 Add To Cart Added! Rock River Arms Coyote Carbine, Complete Upper Receiver, 300 Blackout, 16" Barrel, Smith Vortex Flash Hider, RRA 12.5" Free Float M-LOK Handguard, Anodized Finish, Black, Fits AR-15, Includes Bolt Carrier Group and Charging Handle Assembly BLK0592