I would like to put night sights on both my 9MM and .40 Shields but no gun shop in my area will touch them. They're afraid of cracking the slide while trying to remove the rear sights. Anyone else hearing anything like this?

Cracking the Slide???
That's a first.

Mine was tough, but I decided to sacrifice the rear since I was replacing it anyway. Once I did that it took about ten minutes to cut most of the way down through the sight with a hacksaw, about 75% was enough to relieve pressure to allow the sight to be drifted out.