I guess you’ve never considered the relationship between increasing deadliness of weaponry and increasing peace then?
Have you ever thought of that? How increasing the power wieldable by an individual reduces the overall amount of coercion?
Are you aware of the relationship between nuclear proliferation and war deaths?
It’s interesting stuff. If you haven’t considered this particular phenomenon you should, because it’s one of the most important evolutions of human society in history.
They were able to purchase guns that were extremely functionally similar to the AR-15 since the end of WW2 in the form of the M1 carbine. They were cheaply available as surplus for quite awhile. The difference between the two is mostly in weight and ability to penetrate armor and barriers effectively