It starts with "A well regulated militia..."
A well regulated militia has absolutely no relationship to selling assault weapons to teenagers and/or fantasists.
There is no constitutional "right to bear arms" outside of that context.
And while that's being clarified, it would be also be good to investigate the NRA's Russian money problem.
https://www.theguardian.com/us-news/2019/sep/27/nra-russia-f...
Because the US doesn't have a gun problem so much as a stochastic terrorism problem, blatantly sponsored and encouraged by a hostile foreign power which is known for encouraging extremely destructive cultural subversion.