i'm not too big of a fan of glocks, but i did use a 17 (2nd gen) for a race gun.
had the top of slide milled off, and holes milled around firing pin (rear) to light weight the slide.
had a 2.5lb trigger, reduced the pull/return to about 3mm, and had the "safety" removed.
put a lighter return spring in.
put in custom sights (basically regular ones with crosshatch carved and filled in for easy alignment)
bevelled mag attchmt, custom.
handgrips.
you can do all that stuff with a 1911 as well. i just found it easier to work with plastic.
that thing was easy to shoot. got accused of having a g18.