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
"Had King Kong showed up in Texas, Frank Hamer would have taken him down with his Model 8 in .35 Remington...well, he was kind of big, so maybe his BAR"