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.