Crush it, melt it, shred it, or cut it in the right place(s). ATF tells you how: https://www.atf.gov/rules-and-regulations/bump-stocks
The DOJ ruling also states that you can drop them off at your local ATF office. If I had one I'd do that and get a receipt and file a small claims against Whitaker(not really but it would be interesting).
The DOJ ruling also states that you can drop them off at your local ATF office. If I had one I'd do that and get a receipt and file a small claims against Whitaker(not really but it would be interesting).