Not correct. You may not own a stock and a short barreled Luger unless you also own another Luger that is the correct type for the stock.
Lets say that you only have your 1918 Erfurt and you buy a LP08 or Navy stock, repro or original, you now own the components of a short barreled rifle under BATFE rules. It doesn't matter if you never actually attach the stock, you have established "probable intent".
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If it's made after 1918...it's a reproduction
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