My understanding from some reading and talking to those more expert than myself is that high quality coil springs, such as used in Lugers, do not wear out progressively. I.e., they do not become weaker or lose tension over time during normal use. Like any other part of the pistol they can break, suffer corrosion and the like but these can be detected by inspection. On any Luger purchase I disassemble and inspect all parts under magnification.
I replace or adjust springs if inspection or improper function indicates a need. Otherwise, I leave the springs alone. The Luger is a balanced system and replacing springs on a properly functioning pistol may degrade function, requiring further action to restore function.
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