Doc
With the necessary changes to fire control parts and springs, a '92 can be very smooth and very fast indeed. However: No amount of tuning will render a '92 to be competitive with a tuned up .38 1873.
Follow with Abilene if you will. Yule need a new rifle (Uberti with Short Stroke and Springs) iffin you want to run alongside the '73s. So I agree with Abilene. Practice up yer reloads, transitions and shotgun skills and save a bundle of bucks.
Although there is always a good reason for a NEW RIFLE!!