Scott,
Ron is right on about "Lugers at Random", that is the first recommendation I make to people. Walters's "The Luger Story" is slightly ahead of Datig and Jones, as it is a more recent book and less subject to inaccuracies.
Since you are considering Lugers with barrels longer than 4" you will want to pick up Jan Still's "Imperial Lugers," as this is the era of Navys and Artilleries, as well as 4 3/4" barrel commercial and contract Lugers.
There are specialized books along your line of interest, "The Navy Luger" by Joachim G�¶rtz and John Walter, and "La Luger Artiglieria" ("The Artillery Luger") by Mauro Baudino.
Let us know how your search progresses.
--Dwight
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