Nice catch for the CGF guys. But internet transactions will still be effectively banned if the online retailer doesn't want to ship to the PRK simply because its too much hassle and they don't want to risk a lawsuit.
See northeastshooters.com for evidence of how much frustration and outrage and grief Massachusetts gun owners have to put up with over this exact thing.
Because Mass. is (rightly) known as an anti-gun state with obscure, vague, and highly restrictive laws about guns and ammunition, most out-of-state sellers just aren't wiling to spend the time and risk selling to Mass. residents.
Even when something is clearly legal, they often can't convince someone to sell to them.
Heck, I had the same problem buying a bayonet from Cheaper Than Dirt, right here in Texas, all because of their misunderstanding of "illegal knife" in the Texas statutes.