642-2 trigger pull

[joker4096]

I know that this has been stated before, but the trigger pull on the 642-2 airweight is really heavy since it is a DAO revolver. I was wondering if changing the rebound spring to a lighter one will help in making the trigger pull light. But also, would this affect the hammers pressure when it drops? From looking at the internals as i pull the trigger, i think the hammer is using the hammer spring to drop. here is a picture of the internals i googled.

 

[gb6491]

I was wondering if changing the rebound spring to a lighter one will help in making the trigger pull light.

It might or it might not work at all:
http://www.snubnose.info/docs/two_spring_jobs.htm
Wolff sells a rebound spring assortment pack for $9: http://www.gunsprings.com/Revolvers/SMITH & WESSON/J FRAME/cID3/mID58/dID263
I tried them some time ago, but think I stayed with the stock weight. At the price, it's not a bad investment (especially if it works for you).

...But also, would this affect the hammers pressure when it drops?

No, the hammer spring powers the hammer. Wolff also sells different power hammer/mainsprings; a reduced power one might reduce trigger pull weight, but could also affect reliability. I'd advise against changing to a lighter weight (reduced power) hammer spring in a self defense revolver.
Regards,
Greg

 

[Old Fuff]

The rebound slide spring does two things:

1. It pushes the trigger forward after it's pulled.
2. It rebounds (rotates the hammer backwards after the revolver is fired) so that the hammer nose (firing pin) doesn't rest on a primer, and allows the hammer block to move into the "blocked" position.

The factory springs are designed to be ABSOLUTELY SURE that the lockwork will work as it should, and that the revolver will fire, even under the worst possible conditions. This results in a heavy double-action trigger pull, especially in the small J-frame revolvers that obviously have small and lighter weight lockwork parts. By changing out the factory springs and using lighter ones you can get a lighter trigger pull, but you may also get a combination of spring weights that fails to fire a cartridge during an emergency. If the lighter springs were TOTALLY RELIABLE Smith & Wesson (as well as other manufacturers) would use them.

Now the choice is up to you.

 

[Jim K]

Double +1, Old Fuff. Listen to him, guys.

Jim

 

[Roccobro]

I read up and bought all the goodies to lighten the pull on a pair of 642's I bought a few years back. This was the consensus on the 642 forums:

If you go with the lighter Wolff springs, you *should* use a Cylinder & Slide extra long firing pin. You are likely to get light strikes if you just use the lighter springs.

I ended up doing the "JB bore paste slurry" trick on one. Worked well for smoothing up (and lightening a little) the trigger pull within 100 dry fires.

In the end I just dry firing them 10k times when they returned from the factory. Yeah, that story isn't for here.

Justin