Two things I'd like to add to the slide stop issue.
Never drop the slide on an empty chamber.
- Should you feel the need to replace your slide stop, for any reason, be sure it is a forged, tool steel or machined bar stock part, NOT MIM!
Experienced 1911 shooters will tell you a failure of the slide to lock-back when the gun runs empty will get you killed.
When the adrenalin kicks in, the shooter stops hearing the shots. They stop feeling the recoil, and without the visual lock-back of the slide, will continue to pull the trigger on the empty gun.