Game designer needs help

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I was directed to this forum in the hopes you could help. I'm working on a CRPG, with several others, and I've been assigned to work on the weapons. The game is set in an alternate Earth, where the Nazis won the war, and the hero roams an occupied America with the Resistance. That means new weapons, based off of totally differant circumstances than led to, say, the M-16. The problem is, none of the books I've checked out from the library give more than cursory detail on the weapons I need to research, preferring instead to discuss their development and their impact in battle. Can you guys help me out? The first thing I need- which tells you how difficult it is trying to get this info-is details on the magazine capacity of a Parabellum "Luger," particularly the models that carried 9mm bullets. I can tell you the value of every Luger model made depending on it's condition, but I can't find a simple thing like the magazine load...