I've been thinking about this alot lately. Alot of people say they use shotguns for home defense but I suspect it would be VERY LOUD. You'd probably get hearing damage, right? You can't suppress a shotgun but you sure can do that to a rifle or pistol caliber carbine. But what if your state doesn't allow suppressors? Would you put hearing loss aside and go forth with your rifles and shotguns or would you opt for a 9mm or 45acp carbine of sorts because they're quieter? I learned that a 3dB increase is doubling the perceived noise. I've also read somewhere that an MP5 produced 157dB and that an M4 produced 165dB.....that seems like a huge increase! This means that the M4 is more than 4 times louder than the mp5, right? So if you couldn't get suppressors in your state, would it be logical to just use the rifle because your going to damage your hearing either way, or would it be logical to use a pistol caliber carbine to reduce hearing damage and the chance that you will sustain any hearing damage? BTW, any body have dB levels for SBR's like HK53, AKSU, Colt commando, etc.?