I wounder what it would cost like...
https://www.youtube.com/watch?v=GxIGiQd1Mp0&t=220s
Tho I'm shure the #AK50 won't even pass #proofhousing.
https://www.youtube.com/watch?v=gisbc8h1tAc
In fact, I know folks that would gladly pay the fee if it passes "CIP N" for .50 BMG / 12,7x99mm at my local proofhouse:
https://www.lbme.nrw.de/eichaemter-und-beschussamt/eichamt-koeln-und-beschussamt
Bonus point for it getting a set of sick-ass stamps to it's reciever in addition to that:
https://beschussamt.de/
If Brandon Herrera wants to do that:
Here's the form
https://www.lbme.nrw.de/system/files/media/document/file/antrag-auf-waffenbeschuss.pdf