Well Harris ( if elected ) can in fact ban importation of any guns she wants via. exec. order, but an AWB will have to be passed by congress and can be overturned in the courts...... that said if congress passed another AWB identical to the Clinton Crime Bill then that I could live with for many reasons I won't go into and maybe it would stand up to the Bruen ruling ( history, text, tradition ) but any more than that would not and it may not actually stand up in court for other reasons, but it wouldn't bother me as I am prepared, I have more guns than I could wear out over the rest of my life..... but anything beyond the scope of the Clinton Crime Bill, the only AWB ever passed, wouldn't stand up and won't fly with millions of gun owners either.
Basically any AWB that could survive legal scrutiny ( lawsuits ) ( Heller and Bruen rulings ) will have to grandfather in all the existing firearms, same as the Clinton Crime Bill and no Registration under the NFA unless repeal of the Hughes Amendment which would have to be repealed anyway as nobody could add anything to the NFA with the Hughes amendment intact anyway, that means we can pay the 200 dollar tax stamp and convert to select fire which millions of " assault weapon " owners would willing register to do, so there could be some compromise, but there won't be any mandatory buy backs, that's a pipe dream.
The Clinton Crime Bill banned the import and new manufacture and new sales of assault weapons based on cosmetic features, but did not attempt to ban or register any of the millions of existing already in civilian hands, they were all grandfathered in, also it did not ban new manufacture and sales of semi-auto's as long as they did not have a detachable magazine and more than 1 of any of the list of banned cosmetic features, such as a pistol grip, flash hider, barrel shroud, bayonet, 2nd magazine outside of the grip, folding or telescoping stock.