Another accessory for the Tokyo Marui KSG Gas Shotgun under the Nitro.Vo brand is in stock at Tokyo Marui. The Nitro.Vo KSG KeyMod Long Top Rail has a total length of 420mm and is comprised of standard 20mm Picatinny Rail for the flat top and KeyMod on both sides. Made of aluminium alloy, it is rigid and light enough to be installed and allow you to mount more weapons accessories.