Anyone know if you buy and attach a stock (fixed, collapseable, folding or otherwise) to one of these PTR 9s; does that make it SBR that needs a BATFE tax stamp under NFA?
You need to file form 1 and SBR before you can add a stock, but if you add a sb brace it is ok.
https://www.sb-tactical.com/product/sbt5a/