The argument about the 1938 gun law in Nazi Germany appears time and again in these discussions.
In fact, after 1928 gun restrictions had been loosened. So it became easier for radical militia like the SA to get their hands on guns.
In 1938 the Nazis made it easier for every citizen to purchase guns. Jews hadn't been considered citizens anymore. So you could argue that the new law made it impossible for them to initiate a revolt or something similar. But that had become very improbable. In fact, there was hardly any jewish resistance. Anyway, this is the slippery What-if-field in history.
The fact remains that the toughest gun law was in the Weimar Republic between 1918 and 1928.