Personally, I don’t think you need to worry about availability of ammo & replacement parts ten years out from today.
Either things will have improved a WHOLE bunch, and your concern will be fairly academic;
OR
The greta conflict of teh 21st century will be over and your concern will be fairly academic.
I don’t think this situation is going to become another Afghanistan or Viet Nam. When THIS pot boils over, it’s going to boil dry real quickly one way or the other.
If it were just a question of imported vs. domestic rifle, I'd probably agree. The potential near-term problem is in continued availability of ammo for the AK, very little of which is made commercially here in North America. BATF regulates the importation of all firearms and ammunition into the U.S.; it would be easy to cut off that supply.
I'm sure that the media already has a plan to describe it as "the ammunition used by terrorists worldwide", or some such. And that will be that, until some wily American re-names it the ".311 FUBO" (or some similar name), and begins producing it again (see: .275 Rigby).
Who knows... we might even see smugglers' submarines operating on the Great Lakes!
Getting a bill through Congress to shut down domestic manufacture of .223 Remington (a "sporting" cartridge...) would be much more difficult.
I am increasingly getting the feeling the recent buying binge in ammo and rifles isn’t just a matter of getting in before a ban comes. It honestly feels like there is a meaningful contingent of people who are preparing for the possibility of a major civil conflict. When Americans buy enough guns in two months to outfit the entire Indian and Chinese governments combined—and that doesn’t include what was probably an off the charts January—they aren’t doing it just to go deer hunting.
Not saying I would ever want to see such a nightmare scenario, but something doesn’t feel right about all this...