One of possible interpretations, which AFAIK was even on the books in some state for a time, was that second amendment meant compulsory obligation for each vote

One of possible interpretations, which AFAIK was even on the books in some state for a time, was that second amendment meant compulsory obligation for each voter to buy, out of their own money, a military rifle and stand for militia training periodically - essentially, mandatory militia service. Lots of ways to wring hands about a very badly written amendment.