Like others have said, the answer is no. I have a portable tank filled to 4500 PSI and when I bring it to the range and shoot for the entire day 8 am to 4 pm shooting about 1500 rounds my portable tank will drop to 3000 PSI at the end of the day when the range is kicking us out. I have my .25 GK1 set at about 800 FPS for the 28.39 gr JSB's and when I shoot the JSB 33.95 gr, I just adjust the dial about 1/2 turn and get the same 800 FPS. The GK1 is a blast to shoot, so reliable, accurate, and hands down it shocks regular firearm pistols as they struggle to shoot and only a few can hit the bullseye consistently and none at 25 yards. While they take their time shooting typically 100-200 rounds before they cannot afford to shoot anymore, I am taking my shots on bullseye every 3-5 seconds as that is what my typical range will limit my speed shooting to. I end up using only one paper target and plastering layer upon layer of bullseye stickers on each break as there is no more paper in the bullseye; the others never need to put new stickers as they never shoot enough in the bullseye to matter

The attached picture is at the end of the day shooting 1500 rounds with the first 50 or so when I sighted in my new green dot; after that the shots never were outside of the stickers!
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