Cyma CM077D is a heavyweight, very well-made replica. Its body is made of steel. Front hand grip and stock is made of Polymer. A modern version of the classic AK style. Cyma recently upgraded its internal component s in their replicas , so the CM077D has a 603mm Internal barrel, full metal rack piston, double seal cylinder head. stronger tappet and selector plate, bearing spring guide and high torque motor. FPS ~315