I saw a drop in trigger at Wild West Guns a while back.Not sure how good they are but it might be worth a look.
A replacement trigger may be worthwhile, but the factory sear notch geometry is incorrect. The sear notch is cut with negative angle such that the sear has to cam the hammer back against spring compression in order to release it. To get a really good pull, one must recut the sear notch so that it lies in a plane that intersects the middle of the pivot point.
To accomplish this, I simply clamp the hammer in a vise so that the notch face is slightly above the vise jaw, and the pivot point is centered on the vise jaw. Then I file the notch with a WELL USED file which cuts slowly and very smoothly, right down to the vise jaw. This will correct the faulty geometry of the sear notch.
