The second amendment was a reaction to having lived under the oppression of British rule, not concerns over slave revolts or native uprisings.

That aside, the concept of amendments exist for a reason. It's totally reasonable for Congress today to amend the Constitution if a definition of "arms" is now needed. It wouldn't be the first time a new amendment modified or entirely voided an earlier amendment.

What we don't need is court rulings, executive actions, or even new legislation short of an amendment trying to modify or redefine an existing amendment. If an amendment needs to be changed or clarified that needs to happen at the level of another amendment, anything less is short cutting the system and, in my opinion, not democratic.