my claim that its an individual right comes from cases way before heller.
this is the main problem, people think that 19th century court decisions can change the constitution. jefferson warned about this. the courts are not the final arbiter, we the people are. the people that ratified the constitution were told in no uncertain terms that the federal government had no power to interfere with the arms of the people, so what allows you to accept that they now can?
How do the people get to make the final decision about constitutional interpretation? We don't have national referendum. What if the people voted to prohibit free speech of blondes or Muslims? That is changing the Constitution which you say cannot be done. The government has always had regulations on weapons, so it is not true that the government had no power to interfere with that right:
"James Madison's proposal for those who violated Virginia's game laws captured the important distinction between civilian and military gun use. In a bill to prevent the killing
of deer, Madison proposed that a person who "bear
the differences between bearing a gun for personal use and bearing arms for the common defense."
"In the antebellum period, several states had laws banning the carrying of concealed weapons. Ohio's language is fairly typical: "[W]hoever shall carry a weapon or weapons,
concealed on or about his person, such as a pistol, bowie knife, dirk, or any other dangerous weapon, shall be deemed guilty.'
https://ir.lawnet.fordham.edu/cgi/viewcontent.cgi?article=4021&context=flr
If there can be no interference, then government cannot regulate age, criminal history, etc.