Fully automatic weapons.

>To legally own a fully-automatic weapon requires three things: money, time, and an absolutely pristine criminal record

Git you some, anon.

Start your collection in a year, after your application is approved.

The infringement is in the expensive tax.

https://www.washingtonexaminer.com/its-still-legal-to-own-a-machine-gun-its-also-extremely-difficult-and-especially-expensive