FX Impact .22 M3 600mm Moderator?

I went with the Sumo on my MK2 Impact in .22 700mm barrel. It has been perfect for my needs. When I just recently got my Crown also in .22 I went with the Tatsu. The rifle was already so long with a 600mm barrel that I wanted the shorter moderator. The Tatsu is the same diameter as the Sumo but about two inches shorter. It is also working great for me. Since your impact has a 600mm barrel it is a relatively short over all length. I’d go with the Sumo.
 
I went with a Tatsu and the Huggett Dedicated Shroud. I have them on my 700mm and 500mm Impact.

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My .22 impact mk2 with a 700mm barrel did not got any quieter with the tatsu, compared to the stock FX hollow one. I choosed to stick with the stock FX hollow one, untill I got a huma mod, which made it quieter. The tatsu will make you gun a hair shorter, with no sound benefit over the stock FX hollow one. I would suggest you try another (longer) DonnyFL, or another moderator than tatsu. That just is my experiance.