FWIW, my rifles get a pretty hard time of it (not so much nowadays though) and the fibre optic foresights usually last a couple of years..... and I keep a spare in the stock of my rifle.
They only take a minute to change over.
Have you swept the visioned valley with the green stream streaking though it? Searched the vastness for a something you have lost? Have you strung your soul to silence? Then for God's sake go and do it Hear the challenge, learn the lesson, pay the cost