Did Hitler take away the Jews' guns before world war 2?

Yes he did. Here is a quote from Adolph himself.

"The most foolish mistake we could possibly make would be to allow the subject races to possess arms. History shows that all conquerors who have allowed their subject races to carry arms have prepared their own downfall by so doing. Indeed, I would go so far as to say that the supply of arms to the underdogs is a sine qua non for the overthrow of any sovereignty. So let's not have any native militia or native police. German troops alone will bear the sole responsibility for the maintenance of law and order throughout the occupied Russian territories, and a system of military strong-points must be evolved to cover the entire occupied country." --Adolf Hitler, dinner talk on April 11, 1942, quoted in Hitler's Table Talk 1941-44: His Private Conversations, Second Edition (1973), Pg. 425-426. Translated by Norman Cameron and R. H. Stevens. Introduced and with a new preface by H. R. Trevor-Roper. The original German papers were known as Bormann-Vermerke.

A Gun Control Law Passed by the German Government One Day After Kristallnacht.

Nazi Weapons Act of 1938 (Translated to English)

Classified guns for "sporting purposes".
All citizens who wished to purchase firearms had to register with the Nazi officials and have a background check.
Presumed German citizens were hostile and thereby exempted Nazis from the gun control law.
Gave Nazis unrestricted power to decide what kinds of firearms could, or could not be owned by private persons.
The types of ammunition that were legal were subject to control by bureaucrats.
Juveniles under 18 years could not buy firearms and ammunition.