I've enjoyed this thread. I've spent enough time in Law Enforcement and I've trained hundreds of people in Use Of Force training and I believe that if you carry a gun you need to be prepared for two things if you ever have to use it.
1. You are going to be arrested.
2. You are going to be sued.
I've also mellowed in my old age and I pray that I will never have to use my pistol but if I do I want to make sure that I hit what I intend to hit. That is why I added the RMR, which stands for Ruggedized Miniature Reflex, sight on my Glock. I had it put on the 23 because it gives me the greatest flexibility in regards to ammo and it allows me to mount a light. When I carried it concealed the end of the butt printed. I then started carrying the 26, no more printing but I found that I shot the 23 with the 9mm conversion barrel much better than I shot the 26.
It was at this point that I decided to chop the grip of my 23. As it turns out I love it. IMHO it carries and shoots better than the sub compact. The suppressor sights that are mounted allow you to co-witness the sights with the red dot. If the RMR goes down you still have sights.
Before I modify a gun I think about it in regards to the two main points above. I want to make sure that I will be able to justify my actions in court.
Everything that I have done has been done with the thought that someday I might have to use my pistol in self defense. Nothing that I have done changes any of the safety features. I shoot with the standard Glock trigger.
sde... you should recommend that your friends take their 1911s to a competent gunsmith and have their grip safeties repaired immediately.