Competitive shooters in the US change them fairly often 5-10K. NZ shooters tend to be less fastidious due to the PIA and cost of source replacements and tend to do it when when they start having issues. I replaced a recoil spring once in a fit of guilt, it wasn't having any issues and had a few rounds through it (read six figures). The old spring was about 2cm shorter than the new one. No issues though, that being said it may have been subjecting the pistol to excessive stresses. I started keeping a log on my low round count back up Shadow, the first slide stop went at 7880 second at 12525 currently at 5578...maybe if I replaced the springs more often I'd get fewer breakages. I'd keep spare trigger return springs, I've gone through four or five of those. Replaced the firing pin spring once. I've never replaced me hammer spring. Have broken the front sight (not the fiber). Sometimes things break no matter the preventative regime.
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