SA pull weight

[Strike Eagle]

I've got a M-27 revolver in which I installed a Mikulek spring kit--JM rebound slide spring and mainspring. I did not do any stoning of the hammer or trigger surfaces--all stock. The only metal I removed was from the strain screw, (per the installation instructions) to get the DA pull down to approx. 7 pounds. I've got the DA pull at tad over 7 pounds, thats good-- but the SA pull is about 2.5 pounds and thats bad because the new NRA action pistol 'production' class mandates a SA pull of no less than 3.5 pounds. What can I do to get the SA pull adjusted up to 3.5 pounds so the gun will pass inspection?

 

[Strike Eagle]

I've got a M-27 revolver in which I installed a Mikulek spring kit--JM rebound slide spring and mainspring. I did not do any stoning of the hammer or trigger surfaces--all stock. The only metal I removed was from the strain screw, (per the installation instructions) to get the DA pull down to approx. 7 pounds. I've got the DA pull at tad over 7 pounds, thats good-- but the SA pull is about 2.5 pounds and thats bad because the new NRA action pistol 'production' class mandates a SA pull of no less than 3.5 pounds. What can I do to get the SA pull adjusted up to 3.5 pounds so the gun will pass inspection?

 

[David LaPell]

Not being an expert on how to increase SA pull. I have always been told and read that you should never even touch anything to do with the SA notch on the hammer. I have a 27-2 that has a SA pull like yours, very light about 2 1/2 pounds, and that was without doing any work to my action. I know that some of my revolvers have a bit heavier SA pull. I think that it may have just been the way the 27's were put together. I don't know if there is anything you can do to give it more weight.

 

[john traveler]

Reinstall the mainspring. The S&W design depends on a full-strength mainspring for rated SA pull weight.

 

[bountyhunter]

Originally posted by Strike Eagle:
I've got a M-27 revolver in which I installed a Mikulek spring kit--JM rebound slide spring and mainspring. I did not do any stoning of the hammer or trigger surfaces--all stock. The only metal I removed was from the strain screw, (per the installation instructions) to get the DA pull down to approx. 7 pounds. I've got the DA pull at tad over 7 pounds, thats good-- but the SA pull is about 2.5 pounds and thats bad because the new NRA action pistol 'production' class mandates a SA pull of no less than 3.5 pounds. What can I do to get the SA pull adjusted up to 3.5 pounds so the gun will pass inspection?

Install the strongest available rebound slide spring. The mainspring has very little affect on SA pull, but the rebound slide spring does.

BTW, I will NEVER grind the end of a strain screw because when you get misfres, you are stuck unless you have a spare.

 

[bountyhunter]

Originally posted by Strike Eagle:
I've got a M-27 revolver in which I installed a Mikulek spring kit--JM rebound slide spring and mainspring. I did not do any stoning of the hammer or trigger surfaces--all stock.

I have never seen Jerry's video. Does he recommend stoning the hammer sear faces?

I sure hope not, he will be making a lot of gunsmiths very rich and making a lot of gun owners very unhappy.

 

[folkenheath]

Originally posted by bountyhunter:
I have never seen Jerry's video. Does he recommend stoning the hammer sear faces?

In the video he states never to touch either of the single action sear surfaces with a stone, if that is what you are referring too.

 

[tomcatt51]

You're going to have to go with heavier springs or a longer strain screw or both. Wolff makes a nice assortment of rebound springs. Both the rebound and mainsprings affect your SA pull. Sometimes it can be hard to get a 3 1/2 lb SA pull. There is some variance in the hammer/trigger engagement surfaces. Most of mine (S&W revolvers) with lightened DA pulls end up with 2 - 2 1/2 lb SA pulls.

Do they even try to check the SA pull if you have a bobbed/lightened hammer with no spur?

 

[WR Moore]

There's another way to beat the SA pull specification, but you may not like it-and you need to check the rule book to verify it's legal (expect it isn't in "production"). Simply grind the SA notch off the hammer and convert to DA only. Taking the spur off doesn't hurt, but really doesn't convert the piece to DA only.

This was a standard tactic in PPC competition in dayes of olde.

 

[bountyhunter]

Originally posted by folkenheath:

Originally posted by bountyhunter:
I have never seen Jerry's video. Does he recommend stoning the hammer sear faces?

In the video he states never to touch either of the single action sear surfaces with a stone, if that is what you are referring too.

OK, he is definitely correct on that.