The Original CZ Forum
CZ PISTOL CLUBS => CZ75, 75b, 75 SAO inc the Transitional => Topic started by: perry10 on May 08, 2014, 03:15:28 PM
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Would a 13 lb. hammer spring cause light strikes on a cz75b pistol?
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Welcome to the perry!
To get to your question - Possibly!
There have been reports of some light strikes but typically with lighter main springs.
One way to resolve is to get an extended FP from CZCustom or Cajun Gun Works.
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I got the 15# hammer spring when I got CZ Custom's competition hammer package for my 75B a few years ago. They indicated that the extended firing pin was not needed for the #15 spring but recommended it for the 13# spring. I immediately started having "light-strike" issues with the #15 spring. I ordered and installed their extended firing pin and have not had a problem since.
If you are going to get a 13# hammer spring I'd recommend an extended firing pin (and associated fp springs) from either CGW or CZ Custom.
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I installed the 13# in all my compacts. It's not the extended FP but the FP spring, FP block spring that you need. All but the PCR have th extended FP. My PCR does not have light strikes. If you put the 11.5 HS in then you will need the FP.
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A 13# hammer spring could result in light primer strikes. The 13# hammer spring was accompanied by a reduced weight FPS. I saw two light primer strikes (failed to fire) on Herter's 9mm ammo (made by Sellier and Bellot).
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Would a 13 lb. hammer spring cause light strikes on a cz75b pistol?
Yes, but might depend on the primer you're striking. What ammo/primer are we talking about?
Federal or Winchester ammunition primers will "probably" fire reliably, but others "probably" won't.
As said above, the lighter FP spring and FP Block spring will improve the strike. The 13# or 11.5# hammer spring should fire reliably with all primers up to CCI hardness (and maybe more)if you add the extended FP. Polishing all the action components friction areas will aslo improve the strike. Stickies show where to polish to reduce friction.
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Would a 13 lb. hammer spring cause light strikes on a cz75b pistol?
Yes, but might depend on the primer you're striking. What ammo/primer are we talking about?
Federal or Winchester ammunition primers will "probably" fire reliably, but others "probably" won't.
As said above, the lighter FP spring and FP Block spring will improve the strike. The 13# or 11.5# hammer spring should fire reliably with all primers up to CCI hardness (and maybe more)if you add the extended FP. Polishing all the action components friction areas will aslo improve the strike. Stickies show where to polish to reduce friction.
+1.
Specifically, Federal primers (whether purchased in the form of components or factory-loaded cartridges) use a different priming compound than virtually all other brands. It is an older formula known in the industry as "basic priming compound." It is higher in brisance (flame) and detonates more easily. I mention this because many, many modified pistols will fire Federal primers reliably, but not necessarily anything else.
You will want to test with a brand with lacquered primers (i.e. S&B) or so-called "hard" primers (i.e. CCI/Speer) to be certain.
As you may have gathered, not all models and production years are created equal. In addition to characteristics from wear/use, older CZs may have had Czech-manufactured OEM springs lighter than their nominal specs. This shouldn't be an issue on a pistol manufactured in this century, however.
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My 75 B features a 13 lbs hammer spring since day two and approx. 2.000 rounds. No light strikes ever, shooting S & B and Geco-ammo. Both brands seem to use the "soft" Federal primers.
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my p-01 has the stock firing pin with the cgw reduced firing springs installed and a 13 lb hammer spring and i have never had a ftf using winchester white box, blazer, or remington 115 gr. fmj .