Clark,
As you probably know (but didn't mention
) that is my B-T stock and holster. The holster is one of only two or three known.
Bob,
That is not all of the known Luger stocks. There is one other, the experimental Gomann-Grunow collapsing tubular stock. I have only seen pictures of it, and since there apparently are no examples in the US, no one has filed for an exemption for it with the BATFE.