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Old October 20, 2018, 10:36 AM   #18
Senior Member
Join Date: May 15, 2012
Location: Texas
Posts: 1,923
I find that S&W factory mainsprings vary a lot from gun to gun whether the coil or the leaf. I recently replaced a mainspring in a new 642 that was extremely heavy. It's now about the same as a 642 that I've had for several years. I've seen the same stuff on N and K frame guns. I'd suggest a Wolff standard spring, it may be just what you want. In any case shoot a couple hundred rounds of ammo to make sure it doesn't misfire with the lighter mainspring. If it misfires you gotta go to plan B and learn to live with another gun.
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