Just a note on one point:
"There are a number of firms selling these stocks without warnings."
There is no law against buying, selling or owning a shoulder stock, new or used, original or repro. What is illegal is possessing the stock and also possessing a handgun with a barrel under 16" to which it can be attached unless the combination is registered. (There are exceptions, already covered.)
So companies can make and sell shoulder stocks without the need to "warn" the buyer; it is up to the buyer to know and obey the law.
Jim
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