The problem with at least some of these laws is that restraining orders can be obtained without full due process in which the target of the order was able to defend themselves with a jury, etc.. The constitutionality of that process for obtaining a restraining order aside, forbidding gun ownership in such a case takes away a constitutional right without due process of law, violating the 5th and 14th Amendments. Needless to say, I am not a lawyer, nor do I play one on TV, so the USSC might view the situation differently.
While this is true, the actual problem, is the notion of taking away anyones guns outside of incarceration or being committed.
Logically, there are very few individuals who I'd prefer to see disarmed, but wouldn't want to see incarcerated or committed.
The second amendment was written to be plainly obvious in its scope and intent., In short, No means NO.
Over time, gray area has been contrived and constructed as a rock upon which to build the church of civilian disarmament, built from things like "reasonable" and "public safety", when in fact what is most 'reasonable' and best for 'public safety' is to incarcerate the problem individuals and keep them there until such time it is no longer necessary.