They don’t honestly care about your ammunition. It’s nice that they can charge with possession of such if they want, but the point is to create a stealth registry, and a database with detailed knowledge of who owns what type of weapon. If you purchase 5.56mm it doesn’t take a genius to figure out what sort of weapon you likely have.
After all there is no point to the coding unless they know who it was sold to.
Oh not true.
I always use my 5.56mm in a piece of pipe that I hit with a Craftsman hammer.
No harm in that.