I used a sight pusher to replace the sights on 3 Shields and one M&P 2.0.... I installed the Apex trigger on one of my Shields and the M&P 2.0, so the sights on those two where changed twice. I never had a problem. Were you both using the punch and mallet method. Stupid question, but did he looses the set screw as well?
He was using a brass punch. I was using my site pusher. Neither would budge the rear site. I guess it is feasible that he tweaked the dovetail a bit with the punch pinching the rear site in tighter. It was a couple years ago and all I remember was how pissed off he was at it and how much trouble I had with it too. I am pretty sure he tried using a heat gun too.
I liked his shield. He hated it! It would always impact up and to the left for him no matter what. That is why he decided to change the sites to adjustable sites (I think). It always shot true for me... I think it was just a case of not all guns are always going to fit all people.
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