Victorluis: yes, apparantly the Power Custom Bisley hammer/trigger parts are just like the Ruger parts, but with two differences:
1) enormously "cleaner" inside where it doesn't show visibly but DOES affect feel;
2) The Power Custom Bisley hammer is sculpted just a bit differently at the tip so that it can also be installed on un-modified Vaquero/Blackhawk type grip frames. The Ruger Bisley hammer will tap the top of the non-Bisley grip frames. Not a big deal, because a few minutes with a file can modify the tip of the Ruger Bisley hammer as needed anyways.
John D: you're describing the "poor boy's trigger job" which is detailed in the Gunblast.com article linked above, which comes complete with pics.
HOWEVER, note that this "trigger job" will indeed increase accuracy, but does little for the "rough cocking stroke feel" all too common on some Rugers. The Power Custom parts, on the other hand, will make it feel downright sexy
. You can get there with Wolff springs and some careful de-burring/polishing of the factory parts which'll be a lot cheaper, but the PC stuff is damn fine goods
.