In California not sure about back in the 70s but not now at the very least. Ya have to find the dubiously sane redneck and buy it at a premium. Note if the ATF asks then ya say you found it in the desert cause if ya snitch you will become very aware of the fact that a surprising number of California Rednecks “went backpacking in Ireland” during the troubles and brought back what they learned if ya catch my drift.