I was fortunate enough to be able to compare both the AA and Weihrauch moderators. Admittedly, the comparison was only under dry-fire, but the Weihrauch immediately stood out as quieter (based on the two I tried - I'm sure there is variation), so I went for that one instead.

I was concerned after reading that moderators can affect accuracy, but I've now taken mine out for a proper session, and can confirm it is whisper quiet.

I was testing it next to my sister, who was firing her HW35 (a loud gun, even with its mod), but even so, I was impressed with this moderator. Cost about the same as yours, anth - about 47 including the adapter.