Quote:
Originally Posted by ou1954
Practical: I assume you really mean to ask how many rounds can be fired before the spring (or assembly) should be replaced.
ISMI addresses it on their website, but as related to a 1911.
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How often should the recoil spring be changed? The recoil spring should be changed, at the latest, when it has lost 0.500” of free length from new. At this point, the spring has suffered a considerable reduction in load exerted at installed (when the gun is in battery).
How long will an ISMI recoil spring last? In independent testing, ISMI spring(s) have endured in excess of 100,000 compression cycles. We don’t recommend going that long between changes however. With an ISMI spring, practice routine maintenance and change it once a year.
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Maybe "once a year" is marketing talk, like the old 3,000 mile or one year oil change rule.
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Once a year is absurd, and is certainly marketing talk.
I would like to offer a bridge for sale to anyone who changes their recoil spring once a year. And I recommend they practice routine maintenance by buying a new bridge from me at least once a year.