Ha, here it is..... "cold" guns must be reason (1)-like. I heard BATF had not allowed attaching a stock to a .... even a Borchardt, in 1980s (?), unless it's registered as a NFA weapon (?) .... thanks Lord, they lifted that. Now the tricky part is the stock must be original if it's attached. Whew. Hopefully, they would lift more.
It's interesting to notice dealers like Simpson, FGS put 34xx in their text description. Ironically, the s/n is visible on the pictures. Habitual bahavior, I guess.
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The reason #3 mentioned by Ed makes lots of sense to me.
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