CZ75 SP-01 light strikes

[Howard]

I am having some random light strikes with a CZ75 SP-01 in Single Action. We changed out the main spring to an 11.5# spring, don't have these issues with the 13# spring. I know obviously we could go back to the 13#, but would like to keep the 11.5# if possible. Is there any other part we could change or any suggested part that might be polished more to get the 11.5# spring to work reliably. Has anyone else gotten an 11.5# spring to work well in this gun. Thanks.

[Lon]

Extended firing pin?

https://cajungunworks.com/product/61050-perfection-series-firing/

[cclaxton]

This is going to also depend on the type of primers you are using. Federal primers tend to fire with lighter springs. The extended firing pin is a good idea. But the diff between a 11.5 and 13 pound spring is minor...get reliability. Also, don't forget to clean out the firing pin channel really well...it could be gunked up. I shoot a CZ-75 SP-01 with a 13# spring in IDPA competition and will have a failure to fire once every 1000 rounds. Don't try to push them to the limit and they will be one of the most reliable guns you ever owned.
Cody

[Smitty79]

What ammo are you shooting?

[scw2]

Guy in the below video recommended reduced power firing pin spring and the extended firing pin Lon linked to for the 11.5# hammer spring.


https://www.youtube.com/watch?v=INfJI3pm15U

[Howard]

Thanks for all the ideas. I already have the CGW extended firing pin and reduced power firing pin spring. Also have a reduced power firing pin block spring. Have the USPSA production legal competition hammer and the CGW barrel bushing as well. I am using Freedom Munitions ammo so I really don't know and have no control over the primers. No an option to switch ammo as I have two boat loads of this stuff and never have any issues with it. The firing pin channel should be fairly clean as a friend of mine just did most of this work for me and really scrubbed the gun. I tried the gun out yesterday and absolutely love the way it works, except for the roughly 10% light strikes I was getting in SA mode. The SA trigger pull is 2# 11 oz, and I would sure love to keep it that way. Would polishing the firing pin and maybe the channel reduce friction enough to make the 11.5# viable? If not are there any other solutions short of going to the 13# main spring? If not, might it be possible to remove a coil or two from the 13# and get it down to perhaps 12#? I know that works in a Beretta 92FS. Thanks.

[Leroy]

My Shadows would pop every American primer with a #13 and was federal only with anything underneath that. The 11.5 would fail on CCI maybe once every 300-400 rounds. You maybe able to get it to run if you polish the firing pin and firing pin channel. Also polish the sides of the hammer. I was fine with an 11.5 and Federal so never got to worked up over it. Know some USPSA guys who were successfully running an 8.5 and Federals. Sub 5# DA.

[Armiger]

Unfortunately, if you've already got the extended pin and reduced spring your options are softer primers or a heavier mainspring. I'm hearing that clipping a spring may work but is not ideal and may lead to problems.

To me, the 11.5# is nice, but the difference between it and the 13# isn't huge. The day my 11.5# fails to pop a primer, it's back to the 13# spring that got me thru the first ~15k rounds without issue.

[Greg]

11.5 pound spring is like....


https://www.youtube.com/watch?v=s0m57ONmw8c