Well, YouTuber Machine Gun Mike actually has one.
Watch this video and learn all about what the registered drop in auto sear really is.
So what is it?
What was once a $50 little metal gadget is now worth around $20,000 due to the 1986 ban on newly manufactured machine guns. This little item allows a regular semi-automatic AR-15 rifle (with a couple of M-16 parts thrown in) shoot fully automatic. This one is fully registered and has a serial number, making it completely legal (and expensive) to own.
So if you have a boatload of money and want the fun of fully automatic rifle, start shopping for your own registered drop-in auto sear.
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