Sig P6 Light Strikes

[Olympus]

My father in law is having problems with light primer strikes on his Sig P6. He said that he upgraded the springs to Wolff springs and still had the same issue. He was shooting reloads so he gave me the gun to try with my reloads. I put 50 rounds through the gun today and had 4 light primer strikes with my reloads also. Mine are the same reloads that I shoot regularly in my Glock 26 and 34 and have never had this problem. I don't have any factory 9mm ammo to try though.

Any thoughts on what the problem could be?

 

[ATLDave]

Broken firing pin? Dirty FP channel?

 

[Olympus]

I took some gun scrubber and sprayed inside the FP channel. Wasn't really that dirty. I didn't pull the FP though to check. Seems like if it was broken, there would be more than 4 out of 50 light strikes.

 

[rcmodel]

Here is some trigger pull weight info with stock P6 and a new P225 spring.

http://www.thehighroad.org/showthread.php?t=358615&highlight=sig+p6

Weigh your trigger pull and see if it's somewhere in the same ballpark.

If it's much lower, you need to replace the mainspring.

Rc

 

[ATLDave]

Sometimes a broken FP will just have the very tip chipped off. Just enough to cause an occasional light strike. Don't know how common it is, but I've seen it before.

 

[Olympus]

I'll check the pull weights and firing pin this evening. Thanks.

I just noticed in the P225 armorers manual that it says the pins that hold the breech block cannot be reused once they are removed. I will have to see about locating new pins before I remove these to check the firing pin.

 

[wgsigs]

What weight Wolff mainspring is he using? The P6 normally uses a 28lb while the P225 uses a 24lb spring. I have a 22lb Wolff mainspring in my P6, but have heard of people using as light as a 19lb spring with no light strikes.

I would suspect it is an issue with the firing pin and/or channel as others have mentioned.

 

[ATLDave]

One other thought: I have no idea what kind of firing pin block, if any, that gun uses. But if it has one, it's possible that it's dragging on the firing pin and pulling just enough speed off if to cause problems.

 

[Olympus]

I'm not sure what the spring weight is. He doesn't seem to remember.

 

[L-2]

I've got a P225 and was its first owner. For the purposes of this thread, it's almost identical to a P6. From what's been described, so far, I suspect the hammer spring has weakened over time and round count.

I shot it until it began having light strikes. The hammer spring (also known as, MAINSPRING) became weak enough to cause light strikes. Replacing hammer springs until I obtained a desired trigger pull cured the problem immediately. I first went heavier (~26 lbs), but this trigger pull was very heavy, probably in the 15+ lb range. Actual pull was unknown as my trigger pull gauge only measures up to 12 lbs. I went down to the lowest weight spring of 16 lbs, which has been working fine for several hundreds of rounds, so far. When the 16 lb spring becomes too weak, I have the next heavier spring already in my tool-box ready-to-be-installed.

Changing the hammer spring is a bit difficult, but I was able to do it with some basic tools, which includes a vise, pliers, mallet/hammer. The roll pin which is on the end of the hammer strut and keeps the hammer spring on the hammer strut can be reused, if necessary, but anything to help keep the hammer spring partially compressed on the hammer strut can help in the reassembly.

If you're handy with tools, you should be able to figure out a method which works for you in installing the hammer string on the strut and reassembling the rest with only average effort.

I did later clean out the slide and firing pin area by disassembling the slide and replaced the pins and firing pin spring while I was in there.

Here's one source to do some hammer spring research:
https://www.gunsprings.com/SIG-SAUER (SIGARMS)/P-220/cID1/mID4/dID6

There are other online retailers from which to also buy these springs or even call SIG directly.