“It would take repeal of the 2nd Amendment, for the UN Treaty to have any effect in the United States”
Who says the treaty would repeal the 2nd? The People know that they could easily regulate guns out of existence. We already have thousands of gun laws on the books. You obviously have not been paying attention all these years to the various schemes that have withstood court challenge,
Sorry, but obviously I have, and so far the only gun-control regimes that have been closely inspected and measured against the black-letter law of the Second Amendment have been knocked down by the Supreme Court; the gun-grabbers' successes have been at the appeals court level, in librul jurisdictions, and are vulnerable to reversal.
Of course, the real threat is a couple more "Diesel" Kagans being put on the Court to replace a conservative justice. Then we'd get an outright reversal of Heller, and probably by the same devices by which SCOTUS reversed, in the infamous Lawrence decision (2003), the still-new Burger Court precedent in Bowers vs. Hardwick (1986) which, contrary the Wiki accounting, AJ Kennedy basically ignored while redarguing the whole issue de novo in his majority opinion as if Bowers had never existed.
When the Court starts doing that, there's no justice anymore.