Has anyone done any in depth mods or tuning to a hatsan harpoon? I have been told it uses some sort of gas hammer instead of a conventional spring type hammer.
I ask because mine is shooting under the advertised FPE and FPS. Not a big deal getting over 500fps but would like to be able to tune it if possible like nearly all my spring hammer PCPs.
I ask because mine is shooting under the advertised FPE and FPS. Not a big deal getting over 500fps but would like to be able to tune it if possible like nearly all my spring hammer PCPs.