It probably goes back to records showing what was manufactured w/o numbers. Or date of manufacture.
You can bet that the ATF has special rules and specialists regarding this issue.
As I recall you can make your own gun and not number it, but you can't sell it without numbers. As in buy an AK parts set, buy a partially complete receiver (a flat piece of metal), bend it up, drill a couple of holes, and away you go.
They do encourage you to number it and sent the info. in.
dju
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