The Original CZ Forum
GENERAL => CZ Gunsmithing => Topic started by: schmeky on May 13, 2013, 09:20:36 PM
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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.
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Great.......now I have to spend more money......... ;)
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Glad I have CGW FP in my 2. :)
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Once again...
(http://i.imgur.com/ZsJHyuI.jpg)
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Ought to be good.
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Looking forward to seeing details of the flaw and the fix.
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waiting with money in hand. my gun always needs a new upgrade
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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.
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The interrupt design also serves as the FP travel stop?
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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.
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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.
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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!
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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.
(http://i1082.photobucket.com/albums/j367/schmeky1/NewWebsitePics001_zps2798abe5.jpg)
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.
(http://i1082.photobucket.com/albums/j367/schmeky1/NewWebsitePics014_zpsa11d95a2.jpg)
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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?
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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.
(http://i1082.photobucket.com/albums/j367/schmeky1/NewWebsitePics005_zps6a22f565.jpg)
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Schmeky is a genius with the CZ, who would have thought. When reading about fp issues I get tempted to remove the fpb. It would be great to have a safe fix for removing the fpb such has evolved for the 1911 using a titanium fp to match the fp pin to eliminate the flawed design.
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Do the current CGW firing pins have this "fix" already? Thanks
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When will these be available?
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Xenogy,
The current CGW FP's are almost like the revised versions. We relieve the area on our firing pins where peening can occur. Our FP's are already made from S-7 tool steel.
CAGLS,
The newer versions are going into production this month and will be going out to customers in September. We are also going to offer this same pin for the CZ-97's.
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September...great, I'll have time to save up some cash. Maybe sell some stuff on Ebay and build up some Paypal bucks. ;D
This is pretty much where I'm at, looking at changing firing pin and dropping spring weight. Will these be extended firing pins, or just a factory replacement?
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You tha man David!
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Nice, sounds like I will be placing an order with you in Sep! O0
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Is there an updated estimate on these? Thanks.
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+1. And where can I order one at?
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+1. And where can I order one at?
http://cajungunworks.com/
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+1. And where can I order one at?
http://cajungunworks.com/
Thanks!
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It takes 6 full weeks to make a production run of 2,000 firing pins. Then they have to be heat treated. Production of the new FP's was completed a few days ago and they are off to heat treat. I should have them very soon.
BTW, we are so confident in these new FP's I am probably going to offer a lifetime warranty. They will be that good.
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Wowwie Zowwie!!!
Are these extended firing pins or stock length?
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Extended only. I will also finally offer a totally new, redesigned extended FP for the CZ-97 series too.
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Are these available now?
I may not be first in line, but I'll be in line.
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Nice, David your not helping my CZ addiction. ;)
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Pic of new CGW "Perfection" firing pin. Note how much thicker the tapered end is. Stock pins break at the transition to the taper. This S-7 steel, RC-45 heat treated firing pin will be virtually unbreakable, carrying the only lifetime warranty in the industry for a FP.
(http://i81.photobucket.com/albums/j235/schmeky/NewFiringPin001.jpg)
Its' all in the details. Notice the stock FP tip which has a very small impact area. Notice how much more impact area the CGW "Perfection" FP provides.
(http://i81.photobucket.com/albums/j235/schmeky/NewFiringPin004.jpg)
We are packaging these for distribution and use in all our products, SRS, Ultra-Lite, and bare firing pins available in November.
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Looks nice Guess ill have to buy one, once they become available
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Looks AWSOME! Great work as always my next CZ will have one of those... and if the Pins i have bought from you previously ever break the other guns will have them too.
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David is right, when i installed the defensive carry package on all three of my cz's. Every roll pin that holds the firing pin in place had a little damage because of the design as stated above and soft material. I use a numberb#83 o-ring when I practic dry firing. Snap caps are a waste of money.
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What is the purpose of an extended firing pin, and what else needs replacement or adjustment to avoid rupturing the primer cap?
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What is the purpose of an extended firing pin
When you want a lighter DA trigger pull, decreasing the hammer spring weight is the main answer. There is a limit to how light the spring can be and still be able to fire the primer.
Adding an extended firing pin and a lighter FP spring, allows an even lighter hammer spring and can still fire the primers reliably.
Example" in a full size 75, the hammer spring is 20# stock. Changing to a 15# will likely still fire most primers reliably.
Changing to a 13# ( or maybe even less) hammer spring will still be reliable with an extended FP and lighter FP spring.
Hope this makes sense
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It does, thanks