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My point is that such weapons were already "made," and thus didn't need anything else added. It's all about the "making" part, which seemed to be part of the OP's second question...
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Yes, that was what I was asking.
Essentially imagine this scenario:
30 years ago an agency took a standard non NFA item, like an AR or Shotgun, and converted it to a SBS/SBR NFA item with the paperwork and the parts but didn't engrave it because they were unaware f the requirement to do do. Call that year 1.
10 years go by, the guns is In service.
At year 10 new guns are purchased, the NFA paper work is filed for the new weapons and the NFA barrels from the old guns are swapped over.
At year 10 the old but still NFA registered guns are placed in an armory, perhaps reassembled with the old Non NFA items.
For years 11-29 the guns are used for occasional training and as spares but for the most part they stay forgotten in the armory as does the NFA status
At year 30 someone says those guns are old/worn out, let's trade them in on some new gear.
Dealer comes in and says he'll take them on trade as is and without anyone to notify him that these are NFA guns and no engraving to draw attention to the possibility that something is up.
Essentially, could an LE agency registered NFA item end up on the market being sold as a non NFA item in this situation?