the gearbox has like a bb feeding tube leading into the hop up. its holds quite a lot of bbs so your gonna defiantly lose rounds there.
the compression components
the air nozzel and cylinder head is proprietary. the nozzle has an internal o ring aswell.
the cylinder has no ports. the piston is a clear polycarb with second to last tooth removed and a front metal tooth. inside is has ball bearings and a 2 port clear polycarb piston head.
compression is somewhat good but theres is a airleak. nothing like teflon cant fix
the tappet plate is similiar to a version 3 but is definantly proprietary