Id be willing to bet though if you ask everyone here when that should be done with the guns they have and carry most wont know the answer, and many if not most, dont do it on a regular basis if the gun is shot a lot. If youre not one to keep track of what you actually shoot, and you do shoot it fairly regularly, changing the spring at least once a year wouldnt be a bad thing. This is one of those doomed if you do, doomed if you dont sort of things. Shoot the gun enough that its got a lot of rounds on it and failure is probably imminent at some point, and the way things usually go, at the worst possible moment. Or, you dont shoot it for fear of just that, and now you dont have the necessary time and rounds in, in practice with it, to be as effective as possible with it. And the smaller you go in size, the more important that becomes.