The receiver's internal parts are very simple. The bolt is of the square face design, with the firing pin and shark fin actuator being of one piece. The firing pin extends along the right side of the bolt, then zigs into the bolt neck to protrude out of the face.
PICTURED ABOVE IS THE BOTTOM OF THE BOLT (HOLLOWED OUT TO MAKE IT LIGHTER) AND ABOVE THE SHARK FINNED ACTUATOR.
The most interesting feature of this gun is the quick change feature of the barrel. As shown in the patent drawing on the next page the barrel shroud is held in place by the forearm grip screw. With the screw removed, the shroud can be removed. The shroud itself is a tube with a radial fin assembly attached at the muzzle end. These fins act like those on a Lewis machine gun to allow air to flow in between the barrel and shroud.
Next, the front grip mount is removed by pulling out on the button at the back of the mount. This spring loaded button holds the grip on the receiver. With the button pulled out, the grip mount is pulled forward and off the gun. The grip mount also acts as the retaining key for the barrel.