Quite old thread... but hopefully my 2 cents will help somebody to make a correct decision.
My eyes couldn't stand factory sights and I've replaced front with Meprolight ML17775FS, keeping factory rear sight.
Definitely better !!! Front can be picked up by eyes much faster during the day (the white dot is brighter than factory) and nice small green dot is visible during the night.
My rear sight has blackened dots, so front is even easier to focus on.
Great improvement for few bucks
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