Texas Star gave good advice.
Some gunsmiths removed the hammer block entirely in the belief that it smoothed and lightened the trigger pull. What it does is remove the safety feature that protects the gun from discharge if the hammer is struck or the gun is dropped on it's hammer.
When it was replaced, a K frame hammer block may have been installed.
At any rate, S&W can make it right and restore the marginal SA trigger condition.
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