Design Flaw in CZ OEM Firing Pin

[schmeky]

There is a design flaw in the CZ OEM firing pin used in CZ models with a firing pin block safety, i.e. SP-01, P-01, PCR, 75B, etc.  Good news is there's a solution.  I will show details and the "fix" in a few months. 

In the process of designing/creating a FP that should run practically indefinitely, and should allow for dry firing w/o issue.   

[viking499]

Great.......now I have to spend more money.........

[Riptide439]

Glad I have CGW FP in my 2. 

[JonNC]

Once again...

[Stuart]

Ought to be good.

[tekarra]

Looking forward to seeing details of the flaw and the fix.

[BigHeat]

waiting with money in hand.  my gun always needs a new upgrade

[schmeky]

It's amazingly obvious.  I can see why the OEM spring pin breaks.  As soon as I have a working prototype, I'll post some pics.

[1SOW]

The interrupt  design also serves as the FP travel stop?

[Cesar]

The original design is still relevant; think of when (1975) and where (CZ) the design came from.
How many rounds were those guns expected to go thru in their lifetime? Or, without service?

How cheap and easy it is to replace the pins?

Dave is a great guy, I'm not arguing there at all, far from that, opposite actually.

The gun design back then had quite different roots and application, that's what I'm to say.

[1SOW]

Cesar is right.  I think what may have brought this issue to light is competition or serious range shooters dry firing a lot.  I suspect action round count went up quite a bit  since design inception.
On the other hand, my pins with 60K rds never broke, but I had put in a new one-piece  pin to make removal for cleaning easier.  The original design was very durable for normal use.

[HankC1]

I had a 75B broke a firing pin when I got it used. The first owner appears dryfired it a lot. CZ sent me a firing pin for free. The double roll pin is not that friendly when a firing pin needs to be replaced or removed for cleaning. One reason I switched to Tangfolio!

[schmeky]

I wanted to show one of the flaws in the CZ firing pin.  Look where the .125" retaining pin rests against the retaining shoulder of the FP.  You can see there is a mis-match.  The area where the FP actually contacts the retaining pin is a very small area.  This is where the FP peens and eventually can develop a crack.  This also beats up the stock roll pin retaining pin quickly if dry-fired a lot.


Here is how it should look with the FP shoulder mating perfectly with the retaining pin.  This would distribute the inertia forces over a much wider area.  Combined with the ideal FP material, in this case S-7 tool steel, and the proper heat treating, peening should be virtually eliminated, even with prolonged dry firing. 

[BigHeat]

nice catch in the gap between the retaining pin and the FP.     So what's the second flaw?   Also when do you think these "new"  FP with be ready for sale?

[schmeky]

This where a CZ FP breaks.  This taper narrows down sharply, too sharply.  A more gradual and thicker taper will make the FP much stronger.  Lastly, I had a CZ FP analyzed and it is made from an average grade of tool steel.  S-7 tool steel is vastly superior but expensive.  CGW CZ FP's are currently made from S-7.