I was able to try many some ten years ago and then sold, through here, the ones that didn't suit what I wanted. Either too long, not quiet enough, or some other thing. The one that I kept and still use is a Hogan Decimeator. It ticked the boxes of being acceptable length and diameter vs sound reduction achieved.

It just works. So it has come off the .177 Scorpion T-10 (I had it since 2014 and had it at that time after market regulated by RatWorks) I have just part exchanged with Leicestershire Airguns and gone on to the .22 Scorpion SE it was traded against.