Yawn! There's nothing new here.
Yes, guns may be regulated. Indeed it's well settled law that constitutionally protected rights are subject to limited governmental regulation. Of course any such regulation can be challenged, and whatever governmental authority seeks to impose the regulation can have its day in court and the opportunity to make its case that the regulation satisfies the applicable legal standards for the impairment of a constitutionally protected right.
It's also historically true that the keeping and bearing of arms was subject to some regulation before, at the time of, and after the adoption of the Second Amendment. For an interesting discussion of early gun control, see Adam Winkler's Gunfight: The Battle Over the Right to Bear Arms in America (W. W. Norton & Company, 2011).
Formerly known as fiddletown