That's how my second 23 is. I installed a couple parts and didn't see enough "improvements" to warrant doing it. The ."25" trigger job have best return and was easiest. Anyone owning a GLOCK should know how to tear it down anyhow. Quick and easy job with dremel, a cloth wheel and Flitz!
On my G20 totally different story! I used a "rocket" connector this time along with the .25 cent trigger and and a set of Wolffe extra lower springs and saw a big improvement in the action!
Try polish first, like I say, it's quick and easy.
CW