M4 Gear Box Complete Set (REAR)

ZnAl set of wheels instaled in a 6 mm steel bearings and precision padded. Spring guide is plastic, as well as the nozzle, the piston head is without bearings, with four “exhaust air” holes. The piston is a plastic with one metal tooth, cylinder is brass. Spring SP100. Gearbox includes trigger contacts, wiring, triggers and other small parts.