Hitler's first action was to enact gun laws against undesirables. Jews weren't allowed to own guns. If you're talking about liberal jewish people, I'll agree. They're a spineless lot.
History says otherwise.
The Law on Firearms and Ammunition was introduced to Germany in 1928 under the Weimar regime to disarm the private paramilitary/political groups forming after WWI.
Hitler came to power (peacefully by ballot) in 1933. In 1938, using his emergency power granted earlier by the Reichstag, Hitler extended the law for the duration of the "emergency".
The Nazis didn't need the law, they already had absolute power by 1938 and no party could challenge them. It was just convenient for them to keep it to hold a "legal" club over any citizen that might step out of line.