Trust me, the Tommygun was a heavy rather klutsy gun. Yea, ok, it's an ICON of American guns (due to gangster and WW2 movies) - - - but that doesn't mean it's the best thing since sliced bread.
A Tom Mix-like guy is responding to rustlers stealing his cattle with his Trusty Tommy Gun. Ok.... I'm willing to believe he could do real damage unto those nasty rustlers......
.....and probably a goodly number of the cattle as well.
A nice old ad from the days America was a free country.
But the Tommygun was a commercial flop. Had it not been for WW2 it would only be an asterisk in the bottom margin of some book on Olde Gonnes.
Sorry....but, romantic notions don't change historical facts.