Ignorance has consequences. I wouldn't worry too much about it.
True. An OVERALL length of 16". But if it's not pinned and welded or soldered, it's still a NO GO.
Just because XYZ AR parts house sells 10.5", 12",14.5" barrels, does not make it "LEGAL" to build in to that length config rifle without the proper tax stamps, configurations(no buttstock, pistol config) or whatever.
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