Disagree. Anyway if private gun ownership had been legal and widespread beforehand, the Germans would have confiscated them immediately following the Reichstag fire, possibly as late as the Night of the Long Knives (1934). They'dve been long gone by the war ('39) and the start of the Final Solution ('41).
Its actually very difficult to confiscate hidden weapons, especially if there is no record of who owns them. They're very hard to find. Which is why I'm strongly against any kind of identification or checking of backgrounds of gun buyers.