The Luger spring looked equidistant between the coils to me - but I'm not seeing a picture of the Nambu springs, although I A) Didn't know that, and B) Its pretty obvious from your description - provided that I can see a difference!
ETA: Now I see the picture, I don't have gigabit at home...
ETA2: I'll have to examine my Nambu springs next time I disassemble, I don't recall them looking like your picture at all. But my old brain is starting to miss all kinds of stuff - fortunately, the Nambu isn't going to the range with my wife and I this weekend anyway. If my springs are something like that, they'll either both be backwards, or there'll be one each way!
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