Depending on how SHTF, you might not want a very obvious/bulky rifle.

Consider what happened to the guys in ukraine that posted here. If guys looked like they had a serious firearm like that, they might get shot or abducted by either military force, their own or the invader. You look like someone who's going to start shit. You don't want to look like that guy if military occupation is going down. You want to be the guy who snuck out through the sides before the place got locked down.

Military dudes like the ones you'd need to watch out for are generally trained to watch for where people could hide guns. If they set up a serious papers-please roadblock and you got dragged into it when trying to sneak away, they'll know what parts of you to check for something this bulky.

Personally I just want a handgun that I can hide in a bag, and depending on how SHTF, might ditch it in favor of not getting fucked with if I'm searched at a roadblock or something.

Not saying it won't be useful in other SHTF situations, but just think twice about your disaster scenario and if there are any possibilities it's safer to leave without a firearm than with one.

And like I've said before, if a serious natural disaster sort of event happened, I really don't think the first few days is going to involve raiders shooting people and stealing your stuff. People are going to be shocked and trying to reassemble and look to law enforcement. By the time shit gets bad, you should already be out of there, at wherever you're going. Bugging out is about getting out before shit really hits the fan, getting to where you need to be in 3 days, not about surviving groups of raiders 6 months into a societal breakdown. That's something you can prep for too, but that's not what bugging out is.