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If you manufacture a NFA device from an existing firearm, according to the ATF you DO NOT need to immediately engrave your information into the firearm. Much like how firearms manufactured from a 80% lower receiver don’t require engraving upon completion, the ATF believes that the mere act of...
the author had the atf reply linked when i read it originally, ill keep looking later on.
there is something out there on ATF letterhead that states it