The founders gave us the perfect firearms regulation, the second amendment needs no modifiers.
The founding fathers were also very aware that when a rule is written down, there will quickly be efforts to evade, avoid, and work around it. So they calculated that only bodies of people could balance such a problem by resisting the efforts of other bodies.
This is wise, because the actual body of the 2nd Amendment can be undermined. For example, keeping voluminous records loaded with personal information about gun buyers does not, by itself, violate the 2nd Amendment. But it does facilitate the ability of a tyrant to do so, when he wants to.
Importantly, the constitution needs to be thought of as a framework, that by itself does little, and requires “enabling acts”, written laws, to function. And much of it still exists without enabling acts, so at least theoretically it cannot be enforced.
For example, the constitutional amendment for alcohol prohibition did nothing on its own. Only when the Volstead Act was passed did prohibition come into effect. And by the time it was written, it was made intentionally weak because the political tide had turned.
In any event, over time, federal, state, and local law has frequently conflicted with the 2nd Amendment, so there is a lot of housekeeping to do to erase all those bad laws.