Ron,
"Attaching" is a fine point and probably wouldn't hold up with the BATF. As John pointed out having a stock and a 4" Luger together, whether attached or not, constitutes the components of a short barreled rifle and therefore constructive intent. If, however, you also have the proper Luger for that stock in the same collection, you are home free.
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If it's made after 1918...it's a reproduction
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