Suppressor quieter than a bb gun - 30MagazineClip review
The AB Suppressor AH6-Littlebird 22 can. There is a good chance you haven't heard of this one. But you are going to be glad that you did. This can has a very unique and interesting design. If there are any downsides I sure haven't found them.
AB Suppressors Website: https://www.absuppressor.com/
Official 30MC links