I know they're all loud enough to damage hearing permanently and mine isn't the greatest at the moment and would like to preserve what I have left. I plan on "doubling up" but I know that some guns are still loud enough to hurt you even if you are taking all the precautions you can. I'm in the market for a handgun and was looking at the Glock 42 but now that this realization has come into play I'm starting completely over. Thank you in advance