With me being the poor man. LOL! I came up with a trick (Im sure others have figured this out also) when bench shooting tethered to the air bottle I leave the hose connected to the gun and just open the valve as needed to top off the gun. I don't bleed the hose during my shooting session. This saves the air that would be lost otherwise. I have found that I can watch the gauge on my Tiger Shark tank and when the pressure gets down to 2,200 psi I know its time to top the gun off. Much less expensive than a high quality regulator. In fact so easy that I don't think I will ever need one. My guns have regs so the shot strings should remain consistent. Anyone have thoughts on this technique?