My pp700 (I believe it is called Zasdar in the UK) is really quiet with a moderator.

Love that pistol (.22). Especially with the folding stock. Whisper-silent, great grouping as far as 60 meters. A coca cola can @ 94 meters proved to be (repeatedly) possible as well. 40 pellets at 188 m/s with JSB express (with very little wind offcourse).