I would pick a Keltec carbine so I can leave it folded up and out of sight. A quick Google search shows that such an event occurred in 1989 and knocked out power in Quebec for 9 hours. First, it seems like a pretty rare event. Second, 9 hours without power isn't going to make much of an impact on our daily lives. I was in Muncie years ago when an ice storm knocked out power for 3 days. There was no looting, rioting, roving gun battles, or anything close to a situation requiring a rifle.
The power going out and your eyeballs popping are two different things! Google "mass eyeball explosion incident" and you won't find one because no one lived to tell about it, or they can't see to type. Regardless, I figured it out! I want 2 full auto unwieldy guns. I'll grab 2 fists full of trigger and spin in a circle ala "death blossom". I'd then "Marco-Polo" my ass back to my house.