Thx Grumpy. I've recently starting playing with co2 in my Hipac 2240. Had done plenty of testing with hpa and was pretty pleased at the power and shot count with the little bitty bit of air. With a good fill of co2 i get 55-60 shots @ 560 fps with a 14 inch barrel and stock hammer spring. Have a 24 incher for when i want to get some big numbers on hpa.
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