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If I’m not mistaken, a “militia” was understood to be an ad hoc, non-standing armed group, supplied by the resources of its members. The amendment was added so that if a militia were ever needed (again), it could be formed, because the pool of potential militia members had their own firearms. Laws limiting citizen access to firearms would hobble any new militia.
Given that armies at the time were only recently becoming “standing” (permanent) armies, and the U.S. didn’t really have one, their best option for making war was militias. They were acutely aware that the revolution began that way, and only later developed an actual (organized, separately supplied, long-term) army.
But very quickly, the U.S. developed permanent armed forces and never had to rely on militias again. At that point the 2nd amendment really should have been obsolete.
It also has a 1v1 mode (player vs computer or PvP) that is just fantastic. I actually spent most of my time playing the 1v1 mode way back in the day.