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He'll include a grandfathering clause to keep people from going berserk, but we all know that'll require registration to keep them from being transferred through private sales.
When the ATF outlawed bump stocks under Trump's urging (yes, I said it) after the Vegas shooting, they estimated over 500,000 bump stocks were in citizen's hands. I read just a couple days ago that there were something like 540 of them actually surrendered.