BBF,
When Hitler took office, gun registration laws were already in place courtesy of The Weimar government. After Hitler took power, the only persons who could own guns were the Nazis, Gestapo, Regular Police, the Wehrmacht (military), and regular citizens who were trusted and proven to be brainwashed in the Nazi ideology. Jews, political opponents, and any person who didn't accept the National Socialist program were forced to give up their weapons or be killed.