Sig p226 mk25 not firing

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mdblough

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Hi All,
I have had my 226 for almost 2 yrs now and run probably 1,500-2,000 rounds through it. Lately its has stopped firing - trigger pulls fine, hammer draws back and releases, firing pin is hit, but the pin doesn't appear to be hitting the primer hard enough to fire. On the primer you can see a small mark where it has been hit by the firing pin, but it isn't hard enough. This was happening periodically a few months ago, maybe 1 out of every 10 rounds, but now the pistol will not fire at all. I have tried a few different types of ammo and get the same result.

I was wondering if anyone has any thoughts on what might be the problem. Could it be the hammer spring is finished?

Thanks in advance for you help/suggestions!

Mike
 
First check the firing pin for damage and firing pin hole for any corrosion. Next check firing pin protrusion from the action block. If all is okay then check the sear spring engagement.
 
On an older p226 I had a similar issue and it was built up lacquer from dirty steel case I was using. Might check that out before removing firing pin or springs? Love the mk25 !
 
Dsiwy said:
Might be a broken firing pin or weak hammer spring, hard to tell unless I looked at it.
Click to expand...

Stop listening to everyone else

Your fireing pin's striking tip is broken and only a small nick is remaining to contact the primer which isn't enough to fire a round (ignite primer)

New fireing pin
 
To examine your firing pin tip and travel, you need to engage the safety interlock first before it will move. In the bottom of the removed slide is a small round plunger (which is engaged by the internal safety lever connected to the trigger bar, preventing discharge unless the trigger has been pulled). Push this in with a pencil or anything, now the ‘button’ at the rear which is struck by the hammer will move freely and you can see if the tip is broken or too short.

You haven't messed with the firing pin any? This requires driving out the firing pin stop (retaining pin) across the slide, then pushing in the interlock and catching the pin as it sproings out. The retaining pin is a sacrificial part, so you should have one on hand before beginning such a procedure; there are at least four distinct types through the years — you had better have the correct one. It is possible to re-use some pins, especially if you're careful not to de-form it on removal, but that's difficult and not recommended by Sig Sauer.

Aside from say compressed ends from the driving punch on a re-used pin, the pin may have buckled from lots and LOTS of dry firing. Really neither the firing pin nor its retaining pin should be failing on a 226 with a round count of just a couple thousand, but obviously something is wrong. Dirt seems more likely, but one in ten thousand parts do fail, right?

Wolff gun springs sells an ‘extra power firing pin spring’ for the P- series pistols, but I don't know why because it only ended in light strikes all the time for me (particularly in conjunction with their reduced hammer spring)! You ain't got one of those in there?
 
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