If noise is your biggest concern, I wouldn't worry about it. First, I really wouldn't recommend a less-effective lifesaving tool; defending your life is much more important than protecting your hearing. Second, a few gunshots aren't going to be that big of a deal. Some folks seem to be convinced that firing a gun indoors without hearing protection will leave you looking like a bystander at the bombing of a discotheque, with blood running out your ears and instant stone deafness. I've fired quite a few guns over the years without the benefit of hearing protection, such as when hunting, and my annual audiograms keep coming back satisfactory. If the internet rumors about hearing loss had merit, everyone who was ever a bit slow getting their earmuffs back on after a cease-fire at the range would be learning American Sign Language right now.