My 527 7.62 X 39 will not fire in cold weather.

[david s]

Looking for some other ideas and found this. From December of 2016 on this forum a thread titled "Cz 527, 7.62x39, Light primer strikes." It has a couple of different ideas as well as a link to a different thread about the same issue from 2012. And a second thing Numrich list two firing pin springs for the CZ 527's. A standard $8 dollar spring and a $15 dollar 527 spring for the 7.62X39 rifles. You might Email Numrich and ask exactly what the difference between the two springs are. And now to beat the dead horse. You might try degreasing with a good solvent by soaking the whole disassembled bolt to remove any lube around the bolt sleeve, bolt handle catch and the firing pin. The problem only happening with the rifle cold is my hang up with this repeated suggestion.

[ATXCZFan]

When it doesn't fire, have is the primer dented? I.e., is it a light strike, or is failing to strike it at all. I'd try cleaning all lubricant from the firing pin and the spring and running it dry.

[crosstimbers]

crosstimbers

You are right about the rifle working properly in above sub-zero temperatures.

When the temperature is below about  -15 no ammo works, neither commercial or military.

I have left ammo out all night in below - 15 temperatures , and frozen other ammo in the freezer, and it all works fine in the rifle when it's brought directly from the house.

If I leave the rifle and bolt outside for 30 minutes it will not hit the primers hard enough to detonate them.

The internals of the bolt have been cleaned of all oil and it makes no difference.

I don't just want a new firing pin spring, I want a new heavy duty firing pin spring.

My thinking on the regular firing pin spring was that perhaps your current spring is bad. If you cant find a heavy duty spring, maybe just try a new regular one.

[Explosive]

Looking for some other ideas and found this. From December of 2016 on this forum a thread titled "Cz 527, 7.62x39, Light primer strikes." It has a couple of different ideas as well as a link to a different thread about the same issue from 2012. And a second thing Numrich list two firing pin springs for the CZ 527's. A standard $8 dollar spring and a $15 dollar 527 spring for the 7.62X39 rifles. You might Email Numrich and ask exactly what the difference between the two springs are. And now to beat the dead horse. You might try degreasing with a good solvent by soaking the whole disassembled bolt to remove any lube around the bolt sleeve, bolt handle catch and the firing pin. The problem only happening with the rifle cold is my hang up with this repeated suggestion.

I will contact Numrich. Looks like the 7.62X39 springs could be a known problem.

 BEATING A DEAD HORSE IS A WASTE OF TIME

[Explosive]

crosstimbers

You are right about the rifle working properly in above sub-zero temperatures.

When the temperature is below about  -15 no ammo works, neither commercial or military.

I have left ammo out all night in below - 15 temperatures , and frozen other ammo in the freezer, and it all works fine in the rifle when it's brought directly from the house.

If I leave the rifle and bolt outside for 30 minutes it will not hit the primers hard enough to detonate them.

The internals of the bolt have been cleaned of all oil and it makes no difference.

I don't just want a new firing pin spring, I want a new heavy duty firing pin spring.

My thinking on the regular firing pin spring was that perhaps your current spring is bad. If you cant find a heavy duty spring, maybe just try a new regular one.

The spring is new, the entire rifle is new.

[Explosive]

When it doesn't fire, have is the primer dented? I.e., is it a light strike, or is failing to strike it at all. I'd try cleaning all lubricant from the firing pin and the spring and running it dry.

The primers are dented, just not enough to detonate them.

[crosstimbers]

crosstimbers

You are right about the rifle working properly in above sub-zero temperatures.

When the temperature is below about  -15 no ammo works, neither commercial or military.

I have left ammo out all night in below - 15 temperatures , and frozen other ammo in the freezer, and it all works fine in the rifle when it's brought directly from the house.

If I leave the rifle and bolt outside for 30 minutes it will not hit the primers hard enough to detonate them.

The internals of the bolt have been cleaned of all oil and it makes no difference.

I don't just want a new firing pin spring, I want a new heavy duty firing pin spring.

My thinking on the regular firing pin spring was that perhaps your current spring is bad. If you cant find a heavy duty spring, maybe just try a new regular one.

The spring is new, the entire rifle is new.

It could still be bad (the spring). But whatever.

From the picture you posted, I've got to say....it could just be a trick of the light but that doesn't really look like a "light" primer strike. Or at least not the light strikes that I've had in the past on some firearms, with a very small indention. Still, whatever is going on is keeping you from enjoying your rifle, have you considered taking it to a gunsmith?

[Explosive]

From the picture you posted, I've got to say....it could just be a trick of the light but that doesn't really look like a "light" primer strike. Or at least not the light strikes that I've had in the past on some firearms, with a very small indention. Still, whatever is going on is keeping you from enjoying your rifle, have you considered taking it to a gunsmith?

Here's a couple that I fired in warmer weather.

How would you define a gunsmith ?

[crosstimbers]

From the picture you posted, I've got to say....it could just be a trick of the light but that doesn't really look like a "light" primer strike. Or at least not the light strikes that I've had in the past on some firearms, with a very small indention. Still, whatever is going on is keeping you from enjoying your rifle, have you considered taking it to a gunsmith?
[/quote]

Here's a couple that I fired in warmer weather.

How would you define a gunsmith ?
[/quote]

The same way most people would, someone trained and certified in some way to work on/repair firearms.

I'm going to take a step back from this at least for now. If it's truly a matter of your having tried everything, and nothing has helped, and no ideas are consideration-worthy, then it's time to either take it to a professional gunsmith or return it to CZ.

But consider this, you might want to hang onto it for scientific value. You seem to own the only firearm in existence with a firing pin gets an "innie" in cold weather, just like men do. So, it could be valuable! 

[Explosive]

There is nobody in Canada I know of who is certified to work on or repair firearms.  I think I am as qualified as anyone.

I think the majority of 7.62X 39 527's will have the same issue as mine. It's just that most people don't shoot when it's below -10.

I have contacted CZ Canada warranty department,  ( Wolverine Supplies  )   and am waiting for them to call me back to see what they suggest.

[crosstimbers]

I don't know where in Canada you are but google showed quite a few of them (gunsmiths) in Canada. I would find it incredible if there weren't any.

But CZ should be able to fix the temperature-sensitive shrinking firing pin. Best of luck! 

[Explosive]

I don't know where in Canada you are but google showed quite a few of them (gunsmiths) in Canada. I would find it incredible if there weren't any.

But CZ should be able to fix the temperature-sensitive shrinking firing pin. Best of luck! 

There are many people who call themselves gunsmiths in Canada, they have no qualifications.    I have no gunsmithing qualifications either, but I have held a firearm manufacturers licence for many years. "Gunsmiths " ask me for advice.

CZ Canada will fix my CZ under warranty, so they say.

Have a happy Christmas.

[Explosive]

PS, I think I know what the problem is, but I don't want to alter the rifle to fix it as that will likely invalidate the warrantee.

[crosstimbers]

PS, I think I know what the problem is, but I don't want to alter the rifle to fix it as that will likely invalidate the warrantee.

Out of curiosity- what, pray tell, do you think the problem is?

As for gunsmiths asking your advice, I know how that goes. Tom Selleck was all the time hitting me up about how to be appealing to women. I tried to help the guy but, being in demand is tough.

[Explosive]

PS, I think I know what the problem is, but I don't want to alter the rifle to fix it as that will likely invalidate the warrantee.

Out of curiosity- what, pray tell, do you think the problem is?

As for gunsmiths asking your advice, I know how that goes. Tom Selleck was all the time hitting me up about how to be appealing to women. I tried to help the guy but, being in demand is tough.

I would try to explain but (removed, crossing that line)