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I have never had a problem but never went that far on the same spring in a SIG. SIG recommends spring replacements at certain intervals and 3500 rounds is most likely over the recommended limit. I have had springs lose tension, but never break.
I have not had any issues with the springs in any of my Sigs, but bought replacements for all of them so that when they go I will have a spare handy.
I have about 5000 through my p226 .40 and its still going strong. Going to rebuild it soon springs, barrel ect might even have sig in NH rebuild it.
I have about 5000 through my p226 .40 and its still going strong. Going to rebuild it soon springs, barrel ect might even have sig in NH rebuild it.
The remaining springs aren't under much or any stress, but the recoil spring takes a beating.
I would recommend replacing the firing pin spring but only after 20k - 30k rounds and then only as a precaution. Wolff includes these in many of their recoil spring replacement kits. This is no big worry.
+1 on Wolff springs, I use them on all my Sigs and replace the firing pin spring at the same time. Obviously it's overkill but they include it with the recoil spring so why not.