How horrible could it be? If the fiber falls out, replace it. It's not as if it takes the front sight with it. I have FO sights on three of my pistols, and the fiber came out of one of them, one time, after thousands of rounds. Some of them are definitely more robust than others. I'll take one that protects the fiber, so it is more likely to not come out, over some that try to expose the fiber for greater light tranmission but leave the fiber more exposed to knocks in the process.
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