funny you should ask - I called Ruger today, and they dont have a recommended change interval, but they are sending me a new set of triple springs for my officers 45
they dont list them on shopruger.com, but they do have them
next time tell them its failing to return the slide fully to battery - with factory ammunition - and your think the springs are wearing out to the point of affecting reliability. if function is affected, they should replace them for you.
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