The Lugers produced for Interarms at first had no stock lug for the obvious reason that they were made on the Swiss machinery. But customer demand caused them to add the stock lug so it would be a "real" Luger. They still didn't sell enough to keep up production.
The reason they kept putting it on the P.08, as I understand, was simply because it was in the contract, and the specifications were never changed. The army rationale was probably that the cost savings of removing it would be small, and it would be there if a soldier had a stock and wanted to use it.
Jim
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