This particular story has cropped up before, and has the general overall feeling of an urban legend.
What I do know is that the ATF was looking into banning the IMPORTATION of certain types of shotguns, but nothing beyond that.
Being the sort of guy I am (prone to taking things with a grain of salt) I decided to contact the ATF by phone to get a direct answer.
What I was told, and may not be especially relevant to this thread, is that:
"The ATF did have a specific entry on their website inviting public comment."
What those public comments were in relation to is not clear.
My question was specific to the banning of certain types of military style shotguns, and they could not state that was the purpose of inviting public comment at this time.
As a result, I gave my phone number and name to the person on the phone who promised they'd research the question and contact me with the answer.
When that'll happen is unknown to me, but when the answer comes, I'll be certain to post it here.
Stay tuned for more information.