True. My old instructors always drilled in my head the downsides of muzzle flash in a combat setting, not necessarily in a home defense situation. Plus, if you're anything like me, you'll already be blinding the shit out of your attacker with a quality weapon light anyway, so the actual flash from the barrel will be negligible.
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Still, the hearing protection just isn't something I can see myself grabbing in a SHTF scenario in the middle of the night. I have electronic muffs, too, but I guarantee I won't be mindful enough to grab those if I hear a door kicked in or window smashed. Just grabbing the closest available weapon and putting it, and myself, between them and my family.