The ‘right’ is a venn diagram, not a solid block.
The NRA has a lot of overlap, but Reagan was never particularly pro-gun - he was literally a California Actor, and it was under him that most federal gun laws were passed. (1984 GCA being huge)
In many ways, he was just really good at pretending to be/pushing folks on the rights buttons, while being a smokescreen for all the other laws that people needed to pass. In that way, a lot like Trump is right now.
Notably, Reagan also had dimentia/Alzheimer’s through a large portion of his terms, not that it is related to our current situation at all…