"Just a hint, when purchasing this gun and want to upgrade to a ris rail system, only the dboys m1 rail system will work for this gun, and plus, you can fit a lipo stick battery in the ail system, so no peq box either. :) great gun though, love the red dot scope and sling that comes with it. if any one wants to now how much metal there is on this gun, first off their is the metal gearbox, the hop up inside is a mix of metal and plastic gears, the crane stock is polymer plastic, and so is the handguard, the hand grip, the foward assiting knob is plastic, and the flash hider are all plastic. but the 300 hi-cap magazine, front sight, rail on top of the gun, red dot scope, fixing ring, carrying handle, and the outer barrel are all metal. This gun is still amazing and its lipo ready too!! great if you want to upgrade in the future. Excellent for its price!!!!"