When there is abnormal contact between the rebound slide and the rebound seat on the hammer when the hammer drops in double action, you can usually "hear" the difference in the sound of the hammer impact when it goes into battery.

When the parts are fit correctly, the hammer makes a very clear and loud "click" when it completes it's forward rotation and strikes the frame cutout. When the hammer seat on the rebound slide is a bit too far forward, the sound of the hammer impact is not sharp and distinct.....more like a dull thud.

In this scenario, misfires or "light" primer strikes can often be due to an incomplete follow through on the trigger by the shooter either because of improper trigger technique, or perhaps because of an attempt at "staging" the trigger rearward, instead of pulling it though completely.

If you determine the front of the hammer seat on the rebound is literally "in the way" at the completion of a clean and complete DA trigger pull, you can remove material from the front face of the seat to accommodate the hammer and make a bit more room here. The shape of the seat should remain the same. Another alternative would be to substitute a different rebound slide with a slightly shorter dimension at the front of the hammer seat interface.

Under no circumstances should material be removed from the top of the hammer seat on the rebound slide, as this is a critical part of the primary safety in the revolver.


Carter

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Ret. LE, FA Instr, S&W Armorer