View Full Version : Trigger Pull Lightening (S&W)

September 19, 2006, 06:04 PM
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?

Hunter Customs
September 19, 2006, 10:03 PM
The main spring and rebound spring.
Bob Hunter

September 20, 2006, 09:37 AM
It's pretty straight forward to swap springs. You can get the S&W shop manual at www.gunbooks.com , the best $20 you'll ever spend. Spring kits can be had at www.gunsprings.com , and a good set of screwdrivers (or all 3 items) at www.brownells.com

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...