Quietest setup for Leshiy 2 in .25?

I don’t have a Mod50, just the Mod40. However given the slight difference between the Mod40 and the 0dB and FX mods that I tried on the gun, I think that we are getting diminishing returns from further size increases and close to making no meaningful difference, at least with the 350mm barrel. The 250mm will be louder in any given caliber, and longer barrels will be less loud.

For example, I have just swapped out my 30mm .25 barrel for a 600mm FX barrel. I found the Mod40 worked well, but it was just too long and heavy for this build, so I used on of my many FX hollow moderators. I can hear no subjective difference in the sound. We also have to remember that there are lots of other things contributing to the impression of noise that the shooter gets. Our ears are right beside the valve, and the noise from the whole action at this point is louder than the sound coming from the barrel/moderator. So is the noise from the pellet hitting the target.

From my experience and based on my needs, I would only consider going up to the Mod50 if I was using a 250mm barrel, in a larger caliber (.25 and .30) at relatively high power.

YMMV.

Chris