Haha, this would be a nice gun^^
But as the pump got 75 ml/ pump AND is a semi-tracked pump, pumping is very exhausting. The "pump" movement is easy to do but the "suck"-movement of the pump is exhausting since our muscles are weaker at expanding than compressing if you know what I mean
Apart from this a great thing!
Other thing: does anyone ever try to build up a semi-tracked pump homemade ???