I will be attending a CQB class later this year as well. I guess you think that is Mall Ninja stuff. But if I am using my Carbine in a defensive environment then chances are it will be in my home. And shooting indoors is a lot different than shooting out of doors.
My guess is you live alone and don't have any neighbors close by....
A rifle would be my last choice for use inside a house, frangible ammo or not.
I can see it now, engage the bad guy in the LR and kill the wife or one of the kids two rooms away.
The issues I have with the CQB training is it's worthless for what happens real world in a home break in.
1. You're asleep and or disoriented 2. it's dark 3. the house is a relatively small space 4. you have little idea exactly where the intruder is 5. you go to get out of bed, the wife wakes up wanting to know what's going on and now the bad guy knows you're up and about.
And it hits the fan from there.
So like any ninja, you're in your underwear and you've got the loaded AR leaned up against a wall by the bed. you creep down the hallway clearing every room on the way so the bad guy doesn't get behind you and when you get to the LR the two of you shoot it out. You win, the bad guy goes down.... but wait you live in a split plan house.... the bullets go through the LR or even through the bad guy, through the wall and hit the kid sleeping in the BR on the other side of the house.
Get a dog and a pistol for home defense man.
I'm all for marksmanship training. Take whatever training you like, it's your money. you enjoy that kind of thing and it makes you more confident, feel better about yourself, fine.
But there's a huge difference in being at a class where you know what to expect, your senses are already primed for it and being woke from a deep sleep in the middle of the night.
And I doubt your walls are concrete at the house.
I've seen some of the pistol classes where they teach shooting techniques and I think they're great and anyone who can afford to attend one should.
But this paramilitary stuff..... other than people who were sent by their employers the folks that I know that have gone to them are a bit out there scary dudes that I'd not be surprised a bit if I end up seeing them on TV or dead at a crime scene.
We get them at the range all dolled up in their ninja gear, with the web gear, mag pouches, single point slings and such.... we mostly giggle and say "hey man they're going on "patrol"....
Not saying every one is like that cause they're obviously not, but that's the general perception and it's one that has stuck.