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Old September 19, 2006, 06:04 PM   #1
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Join Date: February 15, 2002
Location: Maryland
Posts: 4
Trigger Pull Lightening (S&W)

I'm a rookie when it comes to revolvers.

How can I lighten the trigger pull on a S&W 640. I understand there may be two springs to change out. Which one(s), and how easy is it for me to do?
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Old September 19, 2006, 10:03 PM   #2
Hunter Customs
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The main spring and rebound spring.
Bob Hunter
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Old September 20, 2006, 09:37 AM   #3
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Join Date: July 1, 1999
Location: Iowa
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It's pretty straight forward to swap springs. You can get the S&W shop manual at , the best $20 you'll ever spend. Spring kits can be had at , and a good set of screwdrivers (or all 3 items) at

Once you know what you are doing the whole process takes less than 5 minutes.

On an defensive gun like the 640, you may want to start with just swapping the trigger return spring and leave the mainspring stock. A #13 return spring is a good place to start.

Tip: a #2 Phillips screwdriver works great to re-install the rebound slide/return spring.

Good Luck...

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