YES............ I didn't give it much hope, but yes, the "Bat" is very effective, as attached to my .22 Lelya. A bit expensive for what it is, but it is quieter than just the original mitigator.
They are very effective have one on my 177 and one on my 25 R5M rifles. Both are easily able to shoot in the back yard at full power, with thr neighbors not hearing a thing.
Just need to find a 22 to round out the collection. Lol