Terrorist Watch List Gun Proposal

As a placeholder, a dissenting opinion joined by two justices on guns. Anyway, one thing tossed out there is blocking those on the terrorist watch list from buying a gun (and perhaps something more), which I discuss in comments here. The proposal might be okay and criticism tends to be exaggerated (right to buy a gun different from various things) but wary about it especially without limits such as judicial process, limiting it to non-citizens etc.