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Both oil and a spring will weaken with use and be less effective . That's why there are recommended intervals to change them. In contrast, the locking block doesn't have an interval because it's not doing any work. A FTRTB is not something I'm interested in at an inopportune moment.
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For Gen 3s, I replace the RSA every 3000 rounds. Everything else just gets a visual inspection.
That's crazy...if it ain't broke don't fix it, I've got way more rounds then that on a couple, still running like they did when they were new.
So, you don't change the oil in your car/truck then, right?
Do you change light bulbs that are still working? Changing oil is not the same as changing a working mechanical part.
Both oil and a spring will weaken with use and be less effective . That's why there are recommended intervals to change them. In contrast, the locking block doesn't have an interval because it's not doing any work. A FTRTB is not something I'm interested in at an inopportune moment.
You can't "look at" oil and tell whether it's becoming less effective. But you can test a Glock RSA (as described above, which is a Glock armorer test) and determine if it needs replacement.
I would
definitely change out an RSA at the recommended interval on a duty or carry pistol. And maybe with a competition pistol too. BUT with a competition gun, I'd probably do (and document) all the armorer tests before and after every match, so I'd know how well parts like the RSA, the connector, and the extractor were performing on a regular basis. Doing that, I would be less worried about round count and more worried about changes in the gun's performance from one match to another, and I'd change parts accordingly.
With that said, the OP is talking about a Gen 3 competition gun. Glock's guidelines call for a Gen 3 RSA lifespan of about 3,000 rounds. At 5,000 rounds, his RSA is probably on borrowed time, and I'll bet it doesn't pass the test as easily as it should after all that use.