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  1. J

    Hatsan Flashpup regulator tuning questions.

    Nope! Is this an essential step? I've got a mechanical background and a drill.
  2. J

    Hatsan Flashpup regulator tuning questions.

    I recently installed a Huma regulator into my wooden flashpup. Standard plenum size, not the XL. I've been seeing guys getting 830fps with 25.4 grain pellets with the reg set to low pressure like 120 or 140 bar, and the hammer spring only a few turns out from home. I was able to average 825...
  3. J

    Hatsan Flashpup consistency & accuracy issue.

    Thanks man, this really helped. There wasn't any felt caught in the baffles, but according to my schematic the nut holding the suppressor to the barrel was installed backwards from the factory. I switched it around and seated the first plastic doohickey into it before reseating the second...
  4. J

    Hatsan Flashpup consistency & accuracy issue.

    I'm shooting .25 cal pellets at around ~810. My flashpup has gone from 1" groups at 35 yards to 3" groups" at 25 yards. Before everything went to poop, I did two things: Shot about 15 cleaning pellets, but without using ballistol. I also may have forgotten to tighten the hammer-spring grub...