Are you near a dive shop that can fill to 4500psi? If so, get a tank! I've never had a pump, went straight to tanks & after a while got a YH compressor to fill them. I can't see that pumping would ADD to the ease & enjoyment of shooting! But then, that's just me. BTW, the terminology gets confused here. A TANK is a Scuba or SCBA. What's on your gun is a BOTTLE, AIR TUBE or RESERVOIR!