Hate to say it but I would not mess with an extended slide stop or any internal parts. They may not be perfect but I don't see a lot of need to mess with them either. I figure sights are kind of a personal choice thing, what works for one person won't for another. I have no desire to mess with my recoil mechanism, trigger group etc. I'd spend the money on magazines, a better mag loader and ammo, ammo and more ammo. Have fun. Oh, and a holster or three.
Decent law abiding people must fear criminals and the law while criminals have nothing to fear.