TexasCHLforum.com

This is just my opionion, No reason to change anything in a Glock. Everything is there for a reason. I have seen a few "customized" Glocks out there, ie..titianium striker kits, other "trigger sets". While some of the connectors might be helpful, I would just leave it alone. Nights Sights are about the only thing you would add that would help increase the value, but anything else is just useless.
A LEO gave me this advice, he was a former Special Forces operator and said a Glock is about the most reliable thing straight from the factory and any kind of customization is just for fun. He even taught me how to shoot at the range, he showed me how to shoot out bullseyes with my Glock 19 at 25 yards. Just my two cents.