ohiochuck,
I've 6 backyard-friendly PCPs, a .22, four .25s and a .30. A .25 and .22 are Taipan Veterans, quiet from the factory. My Uragan .25 needed a $110 AGT moderator from AOA and my FX M3 .25 and MK3 Wildcat Snipers came with moderators marked, "FX Airguns by DonnyFL." Loudest of the group is my Gen One Umarex Gauntlet .25. Other than the Gauntlet, loudest sound is pellet hitting wooden target backstop. WM