Non Fiber Optic sight for a Diana P5 Magnum?

I had sold a P5 Magnum because I was not fond of the sights. I have a second one coming (too good to pass) and was wondering if they have always been fitted with fiber optics? Can you get or has anybody changed them out for target sights? The front being a dovetail is probably not an issue, but the spacing on the rear two mounting screws may be problamatic.



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