Either way is good. For a gun that is shooting high you can either raise the front sight or lower the back sight. If the required amount is .060 or less I'd do it with the hammer as Model-P suggests. However 5" at 12Yds with the sight radius of an 1851 is going to require .115 and that's a big chunk to take off the hammer. That's why I spoke about the front sight.
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