I got a Feinwerkbau .177 from a friend and I thought "Oh boy, silent shooting."
Well, the noise of the piston itself was too loud for my application. Sounded somewhat like someone slamming a door. Amazingly accurate with the Beeman scope on it and the right pellets, though.
Was going to send it back to Beeman for refurbishing, but one of my sons got into it and rebuilt it himself, with excellent results.
And I hate to say this, but it's a bit too noisy with close neighbors. One shot a day, OK, "screen door closing," but more than that gets a bit suspicious.
Terry, 230RN