Uberti Model P

First, where does the gun shoot?  If the gun shoots close to point of aim, there is nothing wrong with it.  It is hits off, more than is acceptable, a small adjustment of the front sight, carefully executed using a 2-oz. hammer and brass drift punch, with the barrel clamped in lead vice jaws will do it.  Usually only a very slight tweak of a few thousandths is needed. 

To determine the sight correction needed use the expression X=RE/D where X is the amount of sight correction needed, R is the sight radius, E is the error measurement between desired point of impact and point of aim, and D is the target distance - ALL DIMENSIONS IN INCHES!

If you get too heavy-handed with the hammer, you might snap the front sight off, particularly if the factory silver-solder job was poorly done.  This happened to me with my .45 Colt Cimmaron Pistolero by Pietta.  I didn't want to heat up the barrel to silver-solder again and have to reblue, so first I tried several types of two-part epoxy - all without success.

What finally worked was to thoroughly clean the sight and its barrel cut, forcefully driving the sight back into its slot and securely staking it in place.  1000 full-charge loads later the sight is still there and the gun is now zeroed.