I have a K22 [18-2] that is misfiring in single action only.

There is absolutely no problem when firing in double action, so

I presume the firing pin is ok. When I have the misfire there is

no indentation on the cartridge. I notice when firing single

action the trigger moves forward with the hammer before I

release it with my finger. I've looked for similer problems on

the internet but could only find misfires in double action. I've

checked the strain screw and it is tight. The firing pin moves

forward for about the thickness of a dime. Again, let me repeat,

the misfires only occur in single action. I was using CCI mini-

Mags, CCI Blazer, and Remington ELEY. All LR. TIA for any

suggestions. Thanks, Bill

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billynash

Sounds like you may have push off developing. Try cocking the hammer with your thumb, then without touching the trigger, see if you can push the hammer forward off the cocking notch with you thumb. If you can, you have push off, and it needs to be corrected asap.


Merry Christmas!!
G4F

I've tried to push off and the hammer doesn't fall. Thanks for the suggestion.
Merry Christmas
Bill

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billynash

It sounds like you need a new sear. Condition "E"?

Google Image Result for http://www.gunbooks.com/gfx/sw.jpg

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"I also cook."

It sounds to me as though the double action sear (the spring-loaded part attached to the front of the hammer) is not clearing the upper arm of the trigger when you release the hammer from single-action position. When the hammer releases, the sear pushes down on the trigger arm and forces it forward, at the same time wasting energy so the firing pin never gets hit hard enough to contact the rim of the cartridge.

This isn't a problem in double action because the hammer release point for DA shooting is just a tad further back than for SA shooting; thus the trigger arm is further up and forward at the instant of release, allowing the DA sear to slide right past it.

The fix is going to involve judicious removal of some metal from a contact surface, but I'm not going to specify which one because I'm not sure I know enough to recommend curative action to others. I had a similar problem on an old M&P once, and got it to work with just a slight rounding to the front edge of the DA sear. My gun works now, but I'm not sure I followed proper adjustment policy. At the time it seemed like a common-sense adjustment, but every bubba'ed gun got to its sorry state by someone who thought he was using common sense when he took a tool to it. I still worry that I "fixed" mine inappropriately.

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David Wilson

I've had this on several of my S&W revolvers. A few had a definite push-off, but some didn't have an obvious push-off.

In those cases, re-contouring the trigger and/or playing with the spring weights corrected the issue (I think I went with a slightly heavier trigger rebound spring, which raised the single-action trigger weight, which meant my trigger finger was applying more pressure and could counteract the trigger's tendency to spring forward).

In spite of this, what you described is a classic symptom of a developing push-off. It will only get worse.

If you have a trigger scale check the single-action pull weight. If it is less than 2# the sear engagement needs to be addressed. If you don't then take it to a gun shop or gunsmith who can check the pull weight. Odds are it is less than 2#!

And, not just a matter of semantics. This is NOT a mis-fire condition, it is a malfunction. To be a mis-fire the firing pin must strike and indent the primer in some way, but the primer does not initiate.

I removed the side plate, flushed the insides, and relubed with Remoil. It's a lot better, but still is not reliable when fired in single action. I guess my best bet is to either find a smith or ship it off to S&W. Thanks to all who replied to my request for help. Bill

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billynash