How much fitting is required to change hammer on a Colt agent snub. Looking to purchase one, but hammer has been bobbed. Can it be replaced with a “drop in replacement” or will it require a gunsmith?
Hammers usually drop in, so you could give it a try. After you install, check trigger pull, timing and push-off. If it checks out you're done, if not it's off to a gunsmith.
Replacement of critical parts like hammers always has the chance that professional pistolsmithing might be needed.
One aid to installation is to remove the double action strut on the front of the original hammer and install it on the replacement.
Also note that over the years hammers did change in small details that can cause problems.
As example earlier hammers lack the circular clearance cut on the right lower side to clear the hammer block safety assembly.
DO NOT ever alter the single action notch of the hammer or the sear tip on the trigger.
If these have been altered in any way, the part should be replaced.
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