If it lacks metal reinforcement at the frame rails, don't fuck with it.
@Cunt Smasher - Load it up and shoot the piss out of it. There are mag extension for it if you wanna go that route. When you're not busy shooting the shit out of it, dry fire the shit out of it. The trigger will improve as it wears in.
If it's a carry gun, and you go to an aftermarket trigger (or even just parts), don't go any lighter than the factory trigger weight. It's a liability concern if you ever have to use it - malicious DAs have hung or tried to hang people for all kinds of aftermarket accessories. Hell, one guy went through three trials before he was exonerated on a good shoot because the DA made a huge deal about the fact that he used a 10mm.
Worst part of a stock Glock, sights, are already changed. Ammo, practice, ammo, practice, then more ammo and practice. Glocks aren't perfect, despite their marketing, what they are is accurate, reliable and damn near indestructible as long as you don't fuck with them. The trigger will suck, it might not fit your hand just right, but if you practice with it you'll become proficient. Those skills will transfer over to other guns as well, I like S&W revolvers, but I'll still warm up with a gen 3 23 so I can appreciate them even more. Speaking of revolvers, has anyone shot one of the new S&W M69 Combat Masterpiece? I keep trying to find a reason to not get one.
It's a Big Horn Armory Model 89 Carbine, I already load 500SW for my revolver and I want this. It's $2600 but it only has a two year warranty, I've never heard of a manufacturer or custom shop that doesn't offer a lifetime warranty otherwise I'd of already bought one.