You better dig up a GOOD sight pusher, especially if the factory sight is pretty tight. Doesn't take much to break that vial. I had mine replaced on a Kimber Eclipse Target. Pistolsmith that did it used a special jig on a milling machine. He said it was a tight fit (factory sight). Also had to dress new FO sight a bit before installing it.
Before taking it to him, I tried to push mine out using a drill press. Couldn't even start to budge it.
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