Wow there's some serious prepper derangement syndrome/fudd lore in here...
First, Id bet my life that any decent quality rack grade AR (Knights Armament, Geissele, FN) from the manufacturer, not some f***ing stupid "build", will at the absolute very least go toe to toe with any combloc AK and absolutely destroy any US made AK when it comes to field reliability.
"Muh shtf" is an absolute fantasy held by a lot of people, including me for a long time, it is simply unrealistic.
A solar flare isnt going to knock out nightvision, it probably wont even dim the lights, sorry guys...
If you think all you need is a battle rifle and 5000 rounds and you're gonna run off to the woods with your wife and kids in f***ing suburban Massachusetts i got news for you.
If you're worried about this shit, you should probably focus on physical fitness, networking and training with likeminded people who are assets, storing up some basic supplies, and learning some basic level survival, infantry tasks, communications, etc.
Seriously all these doomer shtf scenarios are a joke, you need to be "prepping" for more civil unrest, more government, more wars, more crazy weather, stuff like that. If you think even in the worst case that you're gonna be shooting more than a few hundred rounds in any situation you're probably dreaming bros... gotta be honest with yourself.