The sight broke during a shooting session under recoil. No dropping of the firearm. The metal is very thin in this area (holes for springs) and it looks like it was cast, but I can't be sure until I take it to work and check it out under the microscope. I'd say that's it is the weak point.
I don't have a spare Tactical Sport, but it's in the long term plans.
I have an extra Ed Brown Bomar sight, but these are the LPA TRT cut where the adjustment screw threads in the sight and not the slide.