17-4 PH stainless steel is an alloy undetectable by metal detectors. If the ban were lifted, it would be legal to manufacture firearms with this alloy. This would mean that metal detectors anywhere would be pointless. Even if another country invents it first, this ban would certainly limit the availablity of it here.
The threat against our "leaders" arises from their usurpation of power that the Constitution never granted them. The limited government that was envisioned by our Founders would attract very little attention from anyone.
If our Founders were alive today and told that the government was taking half of people's earnings, they would be making plans.