Smith & Wesson sw40c light strikes

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I am looking for some advise to help my old partner fix his older Sigma SW40c pistol. We were doing some shooting today and his pistol had alot of light primer strikes. This pistol was his issued duty weapon when he worked for a different department. He bought the gun when they went to glocks, and was issued a glock when he started at my department. He said that even then it had an occasional light strikes and the striker spring was replaced and the gun became a safe queen, since he just carried his duty weapon.
A few years ago he fell ill with a genetic spinal illness and is wheel chair bound. He had to quit and he cannot work. Since money is tight he cannot afford an expensive carry peice, so he has been carrying his late father's colt 1911. This 1911 has an extreamly high round count, and has shot out two barrels. Last year it got to the point that it was just too unreliaible and funds were too tight to get it reworked. We got the Sigma out and gave it a really good cleaning, and replaced the striker spring just in case. When we took it to the range last year and it ran 100% without a malfunction. We try to shoot every few months, but due to his health it has been a long time.
Today the gun failed to fire more times than it would. This was with different ammo and trying the rounds several times. The rounds that failed, fired in my g27. We cleaned the gun good and made sure the striker channel was clean. We still had the same problem. The striker spring is about a year old with only a few hundred rounds on it. He said that it was the factory strength spring. He is unwilling to let me get him a new gun even if I were to loan him the money. I have offered to loan him one of my guns, but he wont do that either. I really need some help, because I worry about his safety and his family's, with him carrying a gun that may not work. In his condition he cannot fight off an attack. Sorry for the long post.
 
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Are you shooting factory ammo or reloads?

Do the rounds go off on the second firing? If reloads the primers are not seated properly.

Wolf/Tula primers have a very high failure rate if there being used.
 
We were shooting a mixture of factory and reloads. The reloads had winchester and CCI primers. We tried to fire the rounds that failed several times in that gun. They finally fired when shot through my gun. The primers look like the striker is not hitting hard enough. I have only used about 6,000 tula primers, but I never had a problem with them. My Kel-TEC P3at will even set off their regular small rifle primers. They do take a little more pressure to seat properly.
 
Try some white box factory ammo. If you still have light strikes I suggest an aftermarket spring that is a step stronger. Without doing a dimensional analysis of the striker components you can't determine all is well in that area; but, a stronger spring might overcome any minor misalignment or out of tolerance sizes.
 
I haven't tinkered with a Sigma in quite a while but I would think the trouble would be one of these things.

1) Ammo problem (as others have stated)
2) Crud or corrosion in the firing pin channel (clean it out with q-tips and de-greaser and leave it dry)
3) A weak striker spring
4) A broken tip on the striker (or a mis-machined striker with a short firing pin)

It probably wouldn't hurt things to polish up the striker as well.

That is all I can think of right now.
 
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