Even this SCOTUS does not think the Second Amendment is totally unlimited. You do not have a constitutionally-protected right to bear assault rifles.
Supreme Court Won’t Hear Challenge to Assault Weapons Ban in Chicago Suburb • 2015 Dec 7 • Adam Liptak • New York Times
Supreme Court lets local ban on assault weapons stand • 2015 Dec 7 • David G. Savage • Los Angeles Times
The court’s decision, while not a formal ruling, strongly suggests the justices do not see the 2nd Amendment as protecting a right to own or carry powerful weapons in public.