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I need a good set of defensive sights to compensate for my one bad eye(got lazy eye).A buddy of mine is a sheriff and he recomended defensive sights(xs big dot sighting system).The only problem is hes only had them on his M&P for 3 months.I went online and did as much research as possible and I liked what I seen. Except 1 guy on google claimed he bought a set for his Sig and the rear sight kept losing its trtium glo(apparently leaking the hydrogen liquid inside).Know he claimed the company replaced them 3 times within 1 year.Obviously this concerned me due to the price,health hazards,and inconvinience of changing sights constantly. Does anyone have them? If so please give me your story.I am in need of good advice. I plan on putting them on a glock 26 if there worth the price.Someone give me a solution please!!!!!!!!!