The problem with these ads featuring Nazi rhetoric and examples is that
1) there are no legitimate sources to cite where Hitler ever said anything about gun registration, and the ones that are referenced have been proven to be falsely attributed to Hitler or complete frauds, similar to the "behind every blade of grass" quote attributed to Yamamoto, which is now believed to come from MacArthur.
2) gun restrictions, and ultimately prohibition and confiscation, were implemented by the Weimar Republic, not the Nazis. Laws were passed in January of 1919, essentially banning the possession of all firearms, of which was then increased in severity after the Treaty of Versailles, and were law until 1928,when restrictions were relaxed and licensing/registration protocols were put into place. Therefore, it is far more justifiable that the victors in WWI are responsible for what happened to gun ownership, the rise of Hitler and ultimately the Jews being unable to protect themselves, as we implemented the harsh requirements and stipulations of the Treaty of Versailles that inspired The harsh gun laws in the Weimar Republic, which did nothing to stop the Nazis taking power and everything that happened after.
Its important to be sure that the information you put out is correct. This issue of believing and promoting false propaganda is as much an issue for the pro-gun community as it is for the antis