Steambow AR-Series-M10 Upper Black. It features a 10-shot detachable magazine that fit all our arrows as well as multiple different fron sight options. It also has built-in Picatinny rails as well as a manual safety. Specifications for Steambow AR-Series-M10 Upper: Manufacturer: Steambow Color: Black Features of Steambow AR-Series-M10 Upper 10-shot magazine manual safety interchangable front sight options AR-15-style takedown pin Package Contents: Steambow AR-Series-M10 Upper Steambow 710: AR-Series-M10 Upper Black