I have not had any problems with them but I don't own any. However, my neighbor has a set on his Springfield 1911 HRT pistol. They break all too often he says. He IS an HRT Special Agent with the FBI. He is an armorer with them as well and replaces them regulary on the teams pistols. But they work great when they are good! They never had one fail on a mission as they have fired less than a dozen rounds while on a misson. They break when they practice fireing 5K rounds every year from each pistol.
I think you would be better off with night sights.
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