More and more Prime CNC upper receivers for the Systema M4 PTW coming out at RedWolf Airsoft... "A masterfully created upper receiver for the Systema PTW M4 Series, CNC?ed from a solid block of Aluminum, it offers enhanced durability and precise engineering. The integral rail is precisely cut to 210mm wide, and will fit all optional sights both replica and real steel. Features realistic markings laser etched into the body."
