I'm having the same issue as Joseph. I replaced the trigger with a 2-stage model as that's my preference, but stripped 3 of the 4 screws getting them out and actually had to drill one of them out to remove it. I had to drill the safety screw out as well as it seems whoever assembled my Saint...
There's a correction you might want to make to the article - Trijicon makes two Hellcat models. One for the regular slide that uses the rear sight dovetail and another for the OSP that requires an adapter plate to use the optics mount. I haven't used or seen either version, but did want to put...