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Hatsan Hydra Mods

I own both the Hydra(s) in .22 and .25 as well. One was a refurb and I am still correcting it ( currently disassembled). I also own the Hatsan Flash in .25, and all guns I am using Huma regulators. One benefit is it quiets the "ping" of the hammer strike which is a desirable side effect. I measured the tubes once and thought they were different sizes when I did. PM me and I will give you the measurements.