A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
As mentioned in the title, that tells me in 2019 that someone who can squeak through Army Basic Combat Training (aka boot camp) must be allowed to own the small arms currently used by the military.
What am I misunderstanding?
(States with strict gun control laws should love this, because they could greatly raise the bar on gun ownership, while pointing to how well they're following it.)