I would imagine that the OEM rebound slide spring has been altered (cut) or a lighter spring has been substituted. The mainspring strain screw may also be loose, altered, etc. The mainspring itself may also have been changed.
If the previous owner has not touched the hammer and trigger, or altered the internals other than the spring modifications, the issue can usually be resolved by installing a new OEM strength rebound spring, and restoring proper tension on the mainspring.
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Ret. LE, FA Instr, S&W Armorer
Last edited by armorer951; 04-22-2017 at 12:21 PM.
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