I have to agree with Scorch, The ideal of a Luger being present at that time and place is just wishful thinking. Like Johnny Guest, I also have read a number of stories in reference to Tom Horn,nowhere was a toggle link gun mentioned, only a new fangled automatic.
I also have never read of a full auto lugers being used in the 1930's by any of the bad guys. Now on the last I could be wrong,, there may have been a minor player or two with a standard luger but I kind of doubt it.