The Brady Bunch guy admitted it would not, but said their strategy was to seek ongoing incremental restrictions.
That is the strategy, death by incremental cuts. Congress has taxing authority. The President can propose such a tax, but it has to go through Congress. Even when the President's party had both houses of Congress, gun control legislation was deemed to be very difficult to get through Congress. I hope that belief continues.
In Cook County, the tax had to be approved by the Council, not only the mayor of Chicago. The bullet tax was dropped and the per gun tax on new purchases was enacted.