I was looking into changing the trigger connector to decrease the pull weight on my Glock when I came across this link:
http://www.alpharubicon.com/mrpoyz/glock/
That page shows how to strip a Glock down to it's barest components and polish the bearing surfaces of the trigger mechanism to provide a smoother trigger pull.
I just completed this operation and it did work excellently. The trigger on my Glock compared to some others I've shot was relatively a good trigger but it still felt a little gritty before the polish. After it feels a lot smoother and more consistent of a pull.
A few notes for anyone consider doing this to their firearm:
1. It most definitely voids your warranty.
2. Although I would consider this modification of low risk of causing a failure in your firearm still remember you are modifying a firearm in a way not endorsed by the manufacturer and you wear the responsibility.
3. The aim is to polish the parts, not alter the shape or remove excess material. I used autosol, which is a relatively mild polish, on cotton buds to polish all parts.
4. If you pay close attention during the disassembly stage it's quite easier to identify the exact areas that need polishing.
All in all it was worth the half hour it took me to do this and the low risk was far outweighed by how much nicer my trigger feels now.
Sorry for the long post guys, hopefully it's useful to at least one of you
