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Don't mean to hijack the thread, but if a rifle for home defense is your choice, you need to consider ammo selection due to over penetration also.
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Why even choose a rifle for HD? Longer barrel = more exposed around corners. Rifles are typically louder as is your concern. Round penetration is way too much IMHO with a centerfire rifle cartridge. Either way, a reliable pistol and, if need be, a good shotgun are my #1 and #2. When I hear a "bump in the night" the AR stays in the safe.
What did he say?
Sounds like most need to read up on modern ballistics. .223/5.56 is one of the better indoor defensive rounds. Less penetration thru walls than most pistol rounds. After the first wall the round starts tumbling and rapidly loses energy as opposed to pistol rounds which will keep going thru multiple walls.
Why are you concerned about sound? For the bad guys or yourself?
If you have a need for a home defense weapon, in stressful situations when a weapon is needed, you'll have so much adrenaline pumping that loud sounds are the last of your worries.

Don't forget your safety glasses.
As a rule, I never fire weapons without hearing protection. In fact, I use hearing protection any time I think of it; from hammering to sawing and even vacuuming (when women are scarce). The last thing I would ever think about is donning ear plugs when investigating a bump in the night - ain't nobody got time for that. Hell, I don't even take time to put my pants on.
Listen. you're going to want to hear someone shuffling around. How you plan to do this with ear muffs on? This coming from someone who has been indoors when a .223 was fired and I'm still hearing just fine, thankfully.
You left out the "I".FAL. Accept no substitute.