As @Nathan Cooper indicated, under Hitler, most of the civil weapons legislation was not actually Hitler's - he inherited strong gun control laws from Weimar Republic (aside from total prohibition for the Jews since 1938).
However, the laws were written in a way that allowed pretty much unlimited restrictions and limitations by people in power, within the framework of that legislation:
- Guns were required to have serial numbers
- anybody owning one without a serial number had to have one stamped on it.
- Permitting was mostly left up to the policemostly left up to the police.
- Permits were only given to people of "undoubted reliability" who demonstrated a "need"only given to people of "undoubted reliability" who demonstrated a "need" for a gun (Hello from New York City).
Note the laxensess of definitions. The last bullet point was such that pretty much anyone you didn't want to have a gun wouldn't have one.
A very detailed discussion is in the second half of the Straight Dope article hereStraight Dope article here (the first half was mostly devoted to debunking an infamous Hitler's gun control "quote").