CZ 52, 7.65 x 25 firing pin

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Rule3

Rule3

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More of a gunsmithing question

Anyone have one of these classics?. If so have you upgraded the firing pin to the Harrington version
Claims to decrease the trigger pull drastically.
Version 52-2
Is it worth the price of $45.00??:eek:
redesigned FP with detent and spring

Only way I think it could is due to a lighter detent spring??

If it was $25 I would try it.

https://harringtonproducts.com/firing-pins/
 
I replaced all the 52’ factory components with Harrington counterparts & no, I wouldn’t say that the trigger pull was drastically reduced - reduced, yes but certainly not in a drastic fashion.

I went Harrington because original parts were metallurgical trainwrecks just waiting to happen … a combat pistol & one with neglibible sights, a lighter trigger pull was never a priority. Lastly, bear in mind that Harrington’s firing pins negate the factory firing pin block & this, in conjunction with a defective decocker, which were/are not uncommon, is a recipe for disaster. Pre or post-Harrington, I never dropped/drop the hammer on a chambered round.
 
I owned a CZ52 back when they were cheap and available. I read that the firing pins were fragile, so I did no dry firing or anything. Just some shooting. Then one day, I was cleaning after a range trip, and with oily gun and oily fingers, accidentally dropped the hammer on an empty chamber.
I heard the firing pin tip fly across the room and bounce off the wall.
So, yes I replaced my firing pin.
Eventually, I determined I preferred the Tokarev for my 7.62x25 pleasure. Sold the CZ.
 
I haven't fired mine in years but I was well aware of the brittle firing pin issue when it was purchased. I installed one of the Harrington pins and decided to dry fire the old one to to failure, it only took a few tries as I recall. No idea of the life it lived before it reached me. The trigger on mine is very stiff for a single action but I didn't try any upgrades.
 
I shot it today. It is very accurate as is.Even with surplus Bulgarian corrosive ammo

The only way I can determine that the Harrington version 52-2 could make the trigger lighter is with a lighter detent (retractor)spring. It is the only thing that interacts with the trigger. I polished the retractor/lock and it made no difference

The spring they put on the FP only prevents it from slamming, which is what caused the cast pins to break

Think I will just get a new machined FP as a backup.
https://www.gunpartscorp.com/gun-manufacturer/cz/auto-pistols-cz/52-pistol

I asked on the CZ forum nothing but crickets
 
I owned a CZ52 back when they were cheap and available. I read that the firing pins were fragile, so I did no dry firing or anything. Just some shooting. Then one day, I was cleaning after a range trip, and with oily gun and oily fingers, accidentally dropped the hammer on an empty chamber.

I heard the firing pin tip fly across the room and bounce off the wall.
Click to expand...


Communism did not have incentives for quality control. Anything shoveled out a Communist factory should be viewed with suspicion.

Two stories.

A wrench turning bud of mine purchased a used convertible Yugo car. It was cheap, it was a Fiat design, and it gained a poor reputation in the US and disappeared. Due to the poor reputation of the things at the time, Bud paid very little for his used Yugo. Bud told me it was not a bad car if you put 20 hours of Quality Control into the thing. I asked him what sort of things were wrong, he said as an example, the Communist Yugoslavian workers had not put the wiring harness from the firewall to the rear lights, in the frame hangers. So the electrical harness was just being supported by the front and rear connectors!

I talked to a West Point metallurgist in between concourses in Charlotte. As a class exercise he had his students section and analyze the ends of axles off Christie suspensions, removed from Russian tanks. These tanks had the wheels snap off their Christie suspension during one of those Israeli/Arab wars, the Arabs were using Russian tanks, and the Israeli's recovered a number of tanks where the Christie suspension wheels snapped off in combat. Disabling the tank obviously. That was the source of the axle ends.

According to the West Point metallurgist, the Russians had "thrown everything into the kettle". In other words, there were a lot of non oxidizing resedials


Residual Elements in Steel

https://www.totalmateria.com/page.aspx?ID=CheckArticle&LN=EN&site=kts&NM=205

Residual elements (Cu, Ni, As, Pb, Sn, Sb, Mo, Cr, etc.) are defined as elements which are not added on purpose to steel and which cannot be removed by simple metallurgical processes. The presence of residual elements in steel can have strong effects on mechanical properties. There is therefore clearly the need to identify and to quantify the effects of residual elements in order to keep these effects within acceptable limits.
Residual elements, or at least some of them, have an influence on processing conditions and regimes, from casting to the final annealing, and possibly on all mechanical properties.

Residual elements, or at least some of them, have an influence on processing conditions and regimes, from casting to final annealing, and possibly on all mechanical properties. A clear distinction has to be made between those residual elements which have an effect due to their presence in solid solution, such as Mo, Cr, Ni, and Cu, and those which have an effect due to their segregation at interfaces (surface and grain boundaries), such as Sn, As, and Sb.

The following non exhaustive list gives some possible metallurgical effects of residual elements on processing conditions and properties of steel products. Residuals may influence:

1. The processing conditions in terms of:
  • Recrystallisation and rolling forces in the hot strip mill: Mo, Cr, Sn, ...
  • Austenite to ferrite transformation, hardenability: All
  • Hot ductility during hot deformation: Zn, Sn, ...
  • Recrystallisation during annealing: Mo, Cr, Sn, ...

2. The surface aspect of the hot rolled and pickled strip: Cu, Ni, As, Sn, ...
  • Due to hot shortness
  • Due to possible synergy of Cu an Sn in hot shortness

3. The embrittlement of grain boundaries: Sb, Sn, As


  • During strip coiling
  • During batch or continuous annealing of low C steels

4. The precipitate/matrix interface segregation phenomena: Sn
  • Ostwald ripening, precipitate growth, texture control
  • Sn on Fe4N, Sn on MnS, Sb on TiC, ...

5. The mechanical properties of the final products: All
  • Hot strips and cold rolled sheets
  • Plates
  • Long products
the list goes on. The influence, if you did not get is, is bad. The material properties of steel are unpredictably reduced by residuals. I am going to claim that Communist steel should always be suspect as there was no incentive to make quality steel.
 
I'm pretty sure that I have at least one of the 52-1 Harrington's installed in one of my 3 CZ52s but I cannot recall after 20 years. I do not recall them offering but the one, basic replacement type at that time, but I may be wrong. Seems that they were selling for, like, $20 at the time.

Last time I shot any of my CZ52s was on Saturday afternoon 12Oct02, but that is a not-really-a-gun-story. ;)
 
GBExpat said:
I'm pretty sure that I have at least one of the 52-1 Harrington's installed in one of my 3 CZ52s but I cannot recall after 20 years. I do not recall them offering but the one, basic replacement type at that time, but I may be wrong. Seems that they were selling for, like, $20 at the time.

Last time I shot any of my CZ52s was on Saturday afternoon 12Oct02, but that is a not-really-a-gun-story. ;)
Click to expand...

I just ordered a new hardened steel (original design) on from Numrichs (Gun Parts)
 
Harrington has three different replacement firing pins not all of which lower trigger pull weight. I installed the one that reduced pull weight. Their instructions said you might have to also replace something else together the low pull rate. I don't remember what it was, and I've lost the instructions. I did replace the other piece (extractor maybe?) and I did get a drastic reduction in trigger pull weight.
 
Bob Meyer said:
Harrington has three different replacement firing pins not all of which lower trigger pull weight. I installed the one that reduced pull weight. Their instructions said you might have to also replace something else together the low pull rate. I don't remember what it was, and I've lost the instructions. I did replace the other piece (extractor maybe?) and I did get a drastic reduction in trigger pull weight.
Click to expand...

Yes, thee have 3 versions. I am not going to fiddle with modifying or buying a overpriced extractor.
The one I bought from Gun Parts is the same as their version #1

A firing pin can not reduce trigger pull, the only thing that may is the indent spring (and polish the lock plunger which I did)as I mentioned above,

Here is an interesting article.

https://unblinkingeye.com/Guns/CZ52FP/cz52fp.html
 
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