Ron,
Correct. But at the same time, Mauser price lists exist dating from the late 1930s, that show that the separate stock was available at extra cost. (Mauser article number 905: Flat board stock with iron, without leatherwork for 7 reichsmarks).
So there are 2 original German sources confirming that the board stock was available commercially for all lugers with a stock lug, regardless of their barrel length. It is true, however, that no proof has been found that an army issued stocked short barrel lugers.
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