FYI the C&R Section III exceptions for pistol shoulder stocks
only apply to factory-original stocks and certain vintage collectible aftermarket stocks, typically those made by Ideal. IOW to be exempt from the NFA, the pistol must have the
right shoulder stock, not just any old stock, and particularly not a stock custom-made in your garage.
It pays to do some research and avoid shoulder stocks that look fishy- e.g. incorrect or absent markings, or unusually clean wood or other hardware. Most of these stocks were dragged through the bush by soldiers, so they should NOT look new!
Fortunately, the Mauser C96 shoulder stock exception in the C&R book is more loosely worded than the shoulder stock exceptions for many other pistols; basically, if a C96 pistol's country of origin matches that of the shoulder stock, you're good. This is not necessarily the case for other pistols; the Luger shoulder stock exceptions, for example, are gruelingly detailed and specific. (This is probably due to the fact that most Lugers have fittings for shoulder stocks, even models that were never sold or issued with one; the reason is that the fittings were also used to affix the pistols to factory workbenches during assembly.)
