Still no word from the BATFE on the matter.
Seems there's another 'conversion kit' on the market, except it doesn't have a barrel...just gives your handgun a stock.
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This product is regulated by NFA rules. Transfer of this product is regulated by NFA rules.
This product converts a pistol into a short barreled rifle (SBR). SBR are regulated under the laws of the National Firearms Act of 1934 (NFA). It is illegal to possess this product unless it is registered with Bureau of Alcohol Tobacco Firearms and Explosives BATF&E (Form 1) or you are a Class 3 Dealer. It is illegal to transfer this product to anyone before they have registered this product with BATF&E.