Yea, blackpowder, the same stuff that it has been the birthright of Americans to possess since well before 1775. It was one target of the arms raid by the BATFE redcoats through Lexington to Concord which set off the American Revolutionary war. Its possession has is protected by both the 2nd and 9th amendments to the Constitution, since passage of the Bill of Rights.
It's no coicidence that these guys are also first rank gun-grabbing Clymers.