Lots of possible causes. Wear from use, or improper modification of the DA trigger cam and/or on the foot of the hammer can also cause the hammer to leave this critical DA interface too early.
Check also for end shake on the yoke or cylinder. A few extra thousandths of forward motion of the cylinder assembly (away from the hand) can sometimes contribute to incomplete carry up.
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Ret. LE, FA Instr, S&W Armorer
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