Now we're seeing Keymod rail systems for AEGs now getting into the market. This URX4 13-inch AEG Rail from Iron Airsoft is now available at EB Airsoft. The Keymod system allows you a reliable and sleeker rail systems and many firearms makers such as Noveske are releasing their new products with this system. Made of aluminium and hard anodized, it is priced at US$76.80, shipping already included.