I have shot a suppressed revolver, S&W .38spcl, that was back in about 93 in Washington state. Compared to the other suppressed pistols at the shoot, it was at least as quiet, and quieter than some.
That I would actually believe. Silencer tech was pretty lowbrow back then. We have come a long way since then. These days good supressed semi-auto's are so quiet it is possible to hear the mechanical action noise and even the ringing of the recoil spring under some conditions.
There were a few much more silent firearms there, mostly .22s if my memory is correct.
Good suppressed .22 pistols are CRAZY quiet. They can easily operate below the action noise. All the shooter hears is "clackety-clack" and then the "thump" of the bullet imnpact.



















































