Nice work. Like your ideas. I thought it would be good to have a pcp fill on the air storage too. You'd have to if it went into production. I think some are a little scared of too much pumping. The design on the Philippine survival rifle is nice. Have not handled one and here they take lots of pumps to charge. still a cool idea.
The 2100; does it have a larger diameter pump tube than the 760. Longer stroke? same valve? looking for the best pumper parts so I can get in on this pumper project. finishing a hpa 2250as now. then on to a pump cannon!