Cz 527 woes (and repairs)

adcoch1

adcoch1

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Centralia Washington
Good afternoon All! I was out shooting over the weekend with a few friends, blowing up tannerite and sighting in hunting rifles, just generally goofing off in the woods. We had targets at 100, 150, and a steel 12" gong at 300 yards. So, with several of us wanting to be the one who set off the tannerite, we were doing some fast shooting. It was fun, until it wasn't.

For me, it became less than enjoyable when my cz527m 7.62x39 misfired. Then a few shots later, it did it again. Then after two more it wouldn't hold back the cocking piece when I'd cycle the bolt. I thought maybe some junk got down in the trigger, so I grabbed a screwdriver, and in the front seat of my pickup, started disassembly.

First surprise was the front action screw was really loose, and that's never happened before. The rear was reasonably tight, but obviously not enough, because problem two was a super slight crack in the stock right behind the rear action tab..
I was shocked at the crack, but it can be glued, still hate that it happened, but the cocking piece not catching the sear really had me baffled, so I put the gun back together and set it aside.

Got to it today, and yep, still cracked stock, wasn't my imagination, but it's really slight, so probably not a huge deal on a light little kicker like this thing. I completely disassembled the trigger, and wiped down the parts, finally got the thing to work again, but these have such a miniscule sear engagement it almost scary! I still don't know if something is wrong, but it's working again as it was, the trigger feels like it should/did before. Maybe just the little crud I wiped out was the issue? I've had guns dirtier from 5 rounds than this thing was though, kinda makes me not trust it for the moment. It's my dream gun, but it let me down. A fall from grace is always disappointing...
 
I tore down the action and cleaned everything up to perfect then reassembled and adjusted the trigger. Got it working again, but I still don't know why it quit working. A loose action cracking a stock I get, and it might just be the finish, but the action should still work. It's not like the bottom metal houses the trigger or anything. It was a weird problem. Going to have to see if it does it again I guess...
 
adcoch1 said:
I tore down the action and cleaned everything up to perfect then reassembled and adjusted the trigger. Got it working again, but I still don't know why it quit working. A loose action cracking a stock I get, and it might just be the finish, but the action should still work. It's not like the bottom metal houses the trigger or anything. It was a weird problem. Going to have to see if it does it again I guess...
Click to expand...
You know now that I'm thinking about it..... I kind of remember tying up my trigger/sear somehow... I don't have the gun on hand anymore to mess with and try duplicate it........ This one's going to bug me...... Maybe I had the over travel set just a little off....
 
If I remember correctly (it's been quite a few years since I messed with one), both standard and set triggers can be adjusted - trigger pull weight, sear engagement and overtravel, just read your manual. Also, it's not a bad idea to put a drop of medium strength thread locker to the set screw for the sear engagement - I believe that this little screw is responsible for your problems.
 
What brand and type of Ammo were you using? And where does it say it was made.... if it does say where on the box? And how often to you break things down for a good cleaning? The 527 is made to fire cheap steal case, and it normally does that very well. Some steel case has very dirty powder that can cause issues sooner or later, but regular maintenance will prevent problems.

I've seen a couple cracked stocks on 527s due to the action screws being loose from the factory or working loose.

My fairly new 527 in 7.62x39 hasn't had any problems, but I've done some preemptive mods such as the hex head screws from J&P Gun Springs in the link below. They may seem pricey with shipping, but they are leaps ahead of the CZ stock slotted screws. Buy once, cry once and move on. I wrap one layer of Teflon tape around the threads of each screw, and they stay put.

https://www.jnpgunsprings.com/CZ-527-PARTS-c20995113

You can send the gun into CZ America to have the stock repaired, but that's a pain. A little wood glue and a non-marring padded clamp will make that area of the stock stronger than it was before it cracked.
 
Beck said:
What brand and type of Ammo were you using? And where does it say it was made.... if it does say where on the box? And how often to you break things down for a good cleaning? The 527 is made to fire cheap steal case, and it normally does that very well. Some steel case has very dirty powder that can cause issues sooner or later, but regular maintenance will prevent problems.

I've seen a couple cracked stocks on 527s due to the action screws being loose from the factory or working loose.

My fairly new 527 in 7.62x39 hasn't had any problems, but I've done some preemptive mods such as the hex head screws from J&P Gun Springs in the link below. They may seem pricey with shipping, but they are leaps ahead of the CZ stock slotted screws. Buy once, cry once and move on. I wrap one layer of Teflon tape around the threads of each screw, and they stay put.

https://www.jnpgunsprings.com/CZ-527-PARTS-c20995113

You can send the gun into CZ America to have the stock repaired, but that's a pain. A little wood glue and a non-marring padded clamp will make that area of the stock stronger than it was before it cracked.
Click to expand...
I was shooting wolf steel case and Serbian brass case if I remember correctly. That and some pmc brass case. It was a mixed bag, but the gun hasn't had 500 rounds thru it yet. It wasn't very dirty, but it wouldn't take much to mess up sear engagement with grit/unburned powder... My son and his buddy were doing their best to burn up al my loose x39 ammo thru the ar, so I was grabbing what I could get to load my little 5 round mags as they loaded the 30 for the ar. We were having a blast, literally!
 
Mizar said:
It is made to fire cartridges that are conforming to the CIP specification, not simply steel cased ammunition - CZ clearly states, that the 527 series are fine with steel cases as long as the manufacturers follow CIP regulations. That's it, nothing more.
Click to expand...
Maybe the point is that it excels at shooting steel case ammo. I am amazed at the accuracy that little rifle normally achieves with cheap ammo.
 
adcoch1 said:
Maybe the point is that it excels at shooting steel case ammo. I am amazed at the accuracy that little rifle normally achieves with cheap ammo.
Click to expand...

^^^ Yep, exactly that. It's a C.I.P chamber so it does steel case really well compared to SAAMI chambers.

By they way, Wolf is a brand name, so it's made in different countries and factories, primarily Russia and Ukraine. TulAmmo makes some of it, and brands it as Wolf. Consequently some Wolf branded is much dirtier than other Wolf branded.
 
Tul is usually dirty, but at least in my rifle, very consistent. Might be the couple cases I bought were assembled mid week before lunch or something. But I have had good luck with Tulammo. But it is dirty as a Chicago call girl.
 
Beck said:
It's a C.I.P chamber so it does steel case really well compared to SAAMI chambers.
Click to expand...
If you compare CIP vs SAAMI chamber dimensions, there are basically no differences, except for the chamber overall length - CIP is 41,00 mm, while SAAMI is 39,19 mm. This difference comes from the prototype cartridge that Russians developed back in the early 40s, which had a case length of 41 mm and later (1948) was shortened to 38,70 mm, but they (as the ones that supplied CIP with the data) continue to cut the chambers at 41 mm. This has nothing to do with steel cases, BTW.
 
*Deleted*

Deleted by me, because apparently all it takes is a little death in the family for me to feel unusually agitated. I'll be back later when I can contribute more constructively.

~Beck
 
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All I can offer is I had a CZ 527M in 7.62x39mm for many years, the last thing I lost right before the divorce. It would shoot OK with steel cased European ammo, but she would stand up and sing with handloads, oddly enough with cast lead bullets from my NOE mold. I miss that rifle...I don't know about stock cracks, as buddy of mine created a unique stock for it, with a spare mag in the butt.

BkzdmaD.jpg

Slgth5z.jpg

Here with the worlds only CZ527M 10 round mag, built by the same guy. It also worked perfectly.

axAvYR6.jpg
 
I'm thinking my firing pin on mine maybe getting weak, thought it was maybe dirty in the bolt but looked pretty clean, there was some oil but don't think it was that. Still haven't shot it yet maybe next week I'm try it again, gun is a 2018 so not to old. Think I was shooting Winchester fmj which is sammi but tried some wolf after and had a few not go. But it seemed the cocking piece was moving super slow and do think the primer was dented. Maybe something is binding somewhere or something. I spot bed mine with jb weld when I first got it so no cracks, think they found out stocks were shrinking some and the recoil lug got some gap and cracked stocks. I removed some wood from behind the tang to, not much maybe .010"
 
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