Steve Halbrook's next book
It's "Gun Control in the Third Reich: Disarming the Jews and 'Enemies of the State'". From the summary:
"Based on newly-discovered, secret documents from German archives, diaries and newspapers of the time, Gun Control in the Third Reich presents the definitive, yet hidden history of how the Nazi regime made use of gun control to disarm and repress its enemies and consolidate power. The countless books on the Third Reich and the Holocaust fail even to mention the laws restricting firearms ownership, which rendered political opponents and Jews defenseless. A skeptic could surmise that a better-armed populace might have made no difference, but the National Socialist regime certainly did not think so—it ruthlessly suppressed firearm ownership by disfavored groups."