My Great-Grandpa carried the "assault weapon" of his day when he was the neighboring county's sheriff in the early 1930s.
He carried a Winchester Model 1907 in .351 WSL.
Intermediate caliber, semi-automatic, detachable magazine.
He also carried a shotgun, but that was more so he could stop and shoot at birds as the mood struck him.
NRA Life Member
"Boy Scout Problem #18: Living with the fear that one day someone will find out you can't tie anything more complicated than a square knot."