I had a set installed on my duty gun in 1988, a 5903 (meprolights). I bought the gun in 2002 when the agency switched to Sig's. The gun is now serving night stand duty, residing in a drawer. The sights are approaching 22 yoa and though they have dimmed, are completely visible in low light. I also had a set on a P7M13 installed in 1984 (trijicon) that I finally replaced this year. I think 20 plus years of service is probably a bit more than one should expect on the average.
Randy
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