We know what this means. Time to start trolling Pennsylvania by posting ads there for incomplete "firearms". The ads will picture shovels, rocks with iron in them, chunks of rusted metal found at the beach, scraps from an auto junk yard, etc. Let's see how serious they are about this and if they pursue anyone for these 0% firearms.
This is unsettling. It's very like Maura Healey's "ruling" regarding "assault weapons". Anti-gun Attorney Generals "interpreting" the law. If successful, I see other states adopting this line of attack...