Hitler and weapons: That is not really right.
The weapon control laws are predating Hitler, enacted in 1928-30. And nobody was forced to give away weapons (apart from psychological instable or criminals).

Of course after Hitler won the election in 1933, he was fast to take away weapons from Jews, making it Germany-wide from 1935 on.

1938 another law was passed that made it easier for people in the Nazi-Orgs to carry weapons - without the permissions every one else needed if he wanted to carry weapons in the open.

But the main point is not that "an armed populace" would have put them down. Why? Most of the populace was enthusiastic about Hitler. The weapon groups (Schützenvereine) were at the front, his biggest fans! He promised work, he promised to keep away a certain religious group, he promised to make Germany great again and to get back what was lost in the peace (Schandfrieden) of Versailles.

You can see why I shudder when looking at Trump, can't you?
(btw: Didn't he said he wanted to make it harder for muslims to get weapons? I thought I read that a bit ago.)