CZ P09 Failures to Fire. Ammo?

[Claymore504]

Thanks for all the great replies. To answer a few questions that I see, yes the CGW firing pin came with the spring and I used it. Also, the primers had excellent marks on them on the cases that did not fire the first time.

Among the parts I listed I did follow the sticky on here for polishing and the trigger on this P09 turned out great! I actually did the same mods to my P07 and the trigger is not as good.

I only have about 500 rounds through the P09 so far. I have a couple other brands of ammo, so I will grab some of each and some more S&B and see if I can get it to happen again.

[SI VIS PACEM PARRABELLUM]

I think I'd explore the defective ammo possibility at this point before I started altering the gun. Factory ammo can be defective just like handloads. There is a possibility that the primers in the failed rounds were not seated fully from the factory and subsequently fired on the second strike.
Just to be sure I'd ensure the gun is clean and the fp is moving feely.

[MarilynMonbro]

When I load S&B primers I occasionally get light strikes too.  I probably got 3 light strikes out of 150 rounds when it first happened. I've designated then training primers and use Winchesters for my match ammo now. With the S&B's I just pull the trigger again and they go off.

My P09 has extended firing pin and spring and 12lb hammer spring. It happens with the 15lb spring too, but it didn't happen with the 18lb. I think those primers are just a little hard.

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[briang2ad]

I've talked to CGW about this also - some guns will run all ammo with a reduced spring, and some will not based on slide/frame fit, etc. 

I DO THINK the 18 LB spring should light all, but again, every gun is different. 

[Hamilton99]

I have a 13lbs hammer spring with -15% firing pin spring and I don`t have any failures on Sellier Bellot ammo (115 and 125grs), all parts from Eemann - I used about 2500 rounds.

[rgunner1]

I run a 10lb hammer spring with a full CGW kit installed in my P09 with a optic cut, I only use it for Comp's and run S&B Primers in club and practice loads and Federal SPP in my match ammo so far no issues and good reliable ignition on both brands and upwards of 3.5k through it, great and very accurate platform.

[DOC 1500]

As mentioned above, using 1500 grit sandpaper lightly rub the areas where the slide and frame touch each other when done wipe down and apply a little bit of moly grease.  Ben Rector slide numerous times by hand.

[briang2ad]

As mentioned above, using 1500 grit sandpaper lightly rub the areas where the slide and frame touch each other when done wipe down and apply a little bit of moly grease.  Ben Rector slide numerous times by hand.

Doc:  What does this do for ignition of hard primers? 

[badwrench]

I think I'd explore the defective ammo possibility at this point before I started altering the gun. Factory ammo can be defective just like handloads. There is a possibility that the primers in the failed rounds were not seated fully from the factory and subsequently fired on the second strike.
Just to be sure I'd ensure the gun is clean and the fp is moving feely.

I think this is possible, if the primer was'nt fully seated at the factory, and left a little "high" that could've very well been the problem. My own experience when loadind 9mm on my then new Dillon 650, I'd get alot of high primers, until I bought a strong mount, which raises the machine about 8-10" off the bench , and you have to stand to run the machine, this also allows you to get more leverage when pushing the operating lever up, and, as a result, my high primer problem dissapeared..