There are 2 types of firearms. Those that are "fitted" and those that are "assembled". Fitted guns were made "before a man's time was worth anything". A Glock is assembled. The Luger is definitely fitted so one piece may, or may not properly "fit" on another Luger. I've had parts, major and minor, go one way or the other. I've had entire upper ends slide right onto a mismatched lower and work correctly, and I've had lesser trigger parts that simply would not interchange.
And then, of course, there were small changes made along the way that may complicate interchangeability, although they were mostly model specific.
Hope this helps.
dju
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