Broke fp

[Tok36]

What size is the o-ring?

Not my pic but i believe that is a #84, or close to it. Anything near that size will work fine, i just eyeball them in the shop when i buy them. I stick with the lower gauge rings so that they sit more on the slide than the firing pin (like in the pic). Some folks even use disposable foam earplugs and swear by them.

The only down side is remembering to remove them. I have heard quite a few storys of no bang first shots due to people leaving their O-rings in.

I accidentally did it once my self on the first shot of my P-09. Woops.... Though i have not tried them, one of the upsides of using an earplug is that they are brightly colored so you cannot miss them.

[Kommiefornia Dreamin]

Not my pic but i believe that is a #84, or close to it. Anything near that size will work fine, i just eyeball them in the shop when i buy them. I stick with the lower gauge rings so that they sit more on the slide than the firing pin (like in the pic). Some folks even use disposable foam earplugs and swear by them.

The only down side is remembering to remove them. I have heard quite a few storys of no bang first shots dew to people leaving their O-rings in.

I accidentally did it once my self on the first shot of my P-09. Woops.... Though i have not tried them, one of the upsides of using an earplug is that they are brightly colored so you cannot miss them.

Thanks! I'm definitely going to try this once my firing pin has arrived.

[enegue]

Your story reminds me of this:

[hambam105]

One is none, Two is one.

[1911su16b870]

Is that forward spring standard on the CZ75? Doesn't that help alleviate dry firing FP breakage?

That was one of the fixes for the CZ52 after hardening it?

[TATER313]

Guess its not as advertised, says dry fire all you want with the cgw retaining pin

The retaining roll pin fixes the issue with the stock retaining roll pin. The stock retaining pin has been known to break from dry firing and use and prematurely fail. David customer service surpasses most companies, from what we have experienced from others in this day and age.

[romukom]

This is a post from David from CGW during development of his CZ Firing pin regarding the retaining pin. Also the taper area of the OEM firing pin is where it breaks. The last picture is the side by side comparison of the firing pins. As you can see, these are design flaw from the CZ.

From David at CGW
"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. "



"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."



<<<<<CGW ----vs----OEM>>>>>>>>>

[Orbiter]

This is a post from David from CGW during development of his CZ Firing pin regarding the retaining pin. Also the taper area of the OEM firing pin is where it breaks. The last picture is the side by side comparison of the firing pins. As you can see, these are design flaw from the CZ.

From David at CGW
"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. "



"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."



<<<<<CGW ----vs----OEM>>>>>>>>>

Very informative details. I'm getting a new CZ 75 soon. Is it best to replace the firing pin and retaining pin early?

[romukom]

I can think of two situation when you want to do it early:
1- IF you dry-fire a lot to practice for competition. Note: if you do the "O" ring or a piece of foam ear plug as mentioned above then no need to upgrade.

2- If you change your main/hammer spring below 13 lbs (75 series; 15lbs in P07/09) Then you need the CGW firing pin because it is a bit longer. Don't recall if the CZ customs firing pin is the same length as CGW.

Right now I am running both stock OEM firing pin in my 75BD and P09. My springs are at the minimum of the recommended weight for stock FP. I do dry fire from time to time without "earplug foam" when function check. Other than that I always put it after safety check.

[guest1]

Very informative details. I'm getting a new CZ 75 soon. Is it best to replace the firing pin and retaining pin early?

If you're near Pasadena and want to speed up your dry firing process by lets say 1350 cycles per hour, I can help you out with this

[romukom]

I just saw that on the other forum. Very clever!.

[Tok36]

This is a post from David from CGW during development of his CZ Firing pin regarding the retaining pin. Also the taper area of the OEM firing pin is where it breaks. The last picture is the side by side comparison of the firing pins. As you can see, these are design flaw from the CZ.

From David at CGW
"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. "


"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."

<<<<<CGW ----vs----OEM>>>>>>>>>

Interesting stuff. I never noticed the radius difference. Thank you for the post.

[romukom]

Indeed, I did not knew that until I stumbled in David's thread. Here is the link

http://www.czfirearms.us/index.php?topic=55988.msg353725#msg353725