This is for anyone interested in gun safety and potential gun control legislation.
A simple question that I ask you answer in a comment without searching for answers online. It is actually several questions but a single concept that should have a single correct answer:
WHAT IS THE HISTORICAL ORIGIN OF THE CONCEPT THAT 10 ROUNDS MARKS A MEANINGFUL THRESHOLD BEYOND WHICH A MAG IS CONSIDER "HIGH CAPACITY"?
Where does this 10-round threshold first show up historically? When?
In what context was it used? For which firearms was it meant to apply?
Now don't cheat with a search engine, just provide a quick answer below. I will score this very fairly.