Armed resistance

I am a workers rights liberal. Probably about as far left as one can be at my age (55).

Two things my liberal friends all seem to agree on. 1) The trump administration is attempting to gain much greater control of the American government. They often use the words "Nazi" and "Hitler". 2) Gun rights should be restricted, and often use mass shootings as justification.

My question to them: When the Nazi's took over Germany, wouldn't a well armed resistance have been useful?