The concerning aspect of the GFSZA is less the impact on the 2nd amendment and more the attempt to shoehorn it in federally under the commerce clause.
Which is why the Supreme Court held in Lopez that the act was an unconstitutional exercise of congressional authority under the Commerce Clause, & why the act was subsequently amended to specifically only apply to guns that had been moved via interstate commerce.
I doubt that's still good enough if it ever gets to SCOTUS again.
Well actually, the revised act has already been challenged again in the courts, & has since been reviewed & upheld by several federal circuit courts. Indeed, in one such appellate case, United States v. Dorsey, it was those minor changes of the revised law that were specifically challenged, & the 9th Circuit ruled that said minor changes were indeed sufficient to correct the issues that had caused the original 1990 law to be struck down in Lopez.
With the current court a 9th circuit ruling isn't definitive. A few years ago they struck down the 75 year old raisin reserve.
