Not sure why everyone is out to get one. If there is a ban, and, as in the past, no grandfather clause, they will be illegal, and have to be sent in, no money back. Think of the Akin's Accelerator.
Yea kind of like all of those high cap mags that were supposed to be turned in in California. No way to trace them so no way to confiscate.
To the OP just wait a year or two and you will be able to buy one cheap. There are tons of them out there and people will get tired of wasting ammo every time they pull the trigger.