I've been through the whole thing. Ordered a Colt Match competition trigger, sent it back.
1911builder took my stock colts, a new 6920 and a new 6721, and polished the trigger surfaces with a stone.
The 6721 came out perfect, MUCH better than the Colt "match" trigger. It feels like the trigger pull of a Heckler and Koch P7, but shorter. A great stock trigger, with enough resistance to convince you it's not a match trigger, but a nice clean predictable break.
The 6920 trigger job didn't work, so I bought a new Colt trigger from SAW (30 bucks) and 1911builder did it again for me. No charge. He had told me beforehand that the trigger on this particular gun, which (like all stock triggers) is manufactured with VERY poor tolerances and has only a hardened surface, did not have a good geometry. It was distinctly different in geometry , purely by chance, from the 6721 trigger. He warned me that it would not have as good a result. He repeated the polishing job on my replacement trigger, and it turned out very similar to the excellent first one. Both are hands down better than the Colt competition trigger.
the difference in trigger parts is pure luck of the draw. If your trigger happens to have been stamped out on a good day at the factory, it could have great potential for a little polishing. If not, you could polish right through the hardened surface and still have a lousy trigger pull, which will then deteriorate as the soft metal wears.
Please note, the quality of the triggers is NOT dependent on which Colt model you buy- just the quality of the stamping of the individual part.
I would recommend you get in touch with 1911builder. He'll tell you exactly what he can do, and whether you would need to send him your lower or just your trigger. I would bet he could look at the trigger and tell you in a minute or two whether your particular trigger is going to polish well, or if it will be risky. Bottom line, he absolutely guarantees his work, and will not stop til you're happy.
Smoothing the surfaces of the trigger is a much more reliable method than replacing springs, or bending them, or whatever you're supposed to do in 15 minutes.
I leave for Germany Tuesday and will be gone 10 days, so I may have difficulty following up on this discussion. Talk to 1911!!