From CSA: The reason for the broken bolts in the VZ58

Eat Jerky said:
So if CSA is telling people if theirs is a problem rifle, is there a SERIAL NUMBER range (batch all affected) or was it a random manufacturing error. Would CzechPoint USA or just the factory in Cz republic know this.
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They should. CSA should just have a factory recall on the affected firearms. I bet they have a pretty good idea which rifles are defective by serial number.
 
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I'm also marking this to follow, also wondering where a list of serial numbers may exist?
I have not put many rounds through my 7.62, non-restricted version but don't want any surprises.
thanks,
 
Anyone know if the non restricted, chrome lined, 7.62x39 models with AR-15 telescoping stock have these problems? I was thinking of picking one up but now I am not so sure.
 
Movie arms is the company that csa has an agreement with to do warranty work on their rifles here in Canada. It saves us from having to ship the gun back down to the states or where ever they are located. As far as I understand
 
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Anyone here have any more info on gas piston diameters? How much smaller a piston are we talking and can I have my local machinist turn mine down a couple thou or whatever it is going to be? I have one unit that fires brass in the vicinity of 5m, and another that pitches them way out (8-9m).
 
Has anyone had any issues with the front sight coming loose from the barrels on these guns? having lots of issues with this model...
 
It's really easy to check. Get 2 drill bits: 2.6mm, and 2.4mm diameter. If the 2.4mm diameter drill bit fits in the gas hole, but the 2.6mm does not - then your rifle is within spec. The correct spec is 2.5mm.
 
superlative said:
It's really easy to check. Get 2 drill bits: 2.6mm, and 2.4mm diameter. If the 2.4mm diameter drill bit fits in the gas hole, but the 2.6mm does not - then your rifle is within spec. The correct spec is 2.5mm.
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Appreciate the info. However, we're not on the same page. I have one with ports I know are out of spec. Wondering if anyone has dimensions on how much smaller the replacement gas piston is? It shouldn't be that hard to reduce the diameter on the existing piston. I remember reading one post somewhere that someone had done it already, but I just can't find it anymore. Trial and error are fine, but if someone has a micrometer and a replaced piston, it gives the rest of us a place to start is all.

The specs you posted are still good though and I have them written in the good ol' gun-bench notebook now. Thanks.
 
I have a CSA 11.8 carbine in .223 and a CZH2003 in 7.62x39. The piston and the gas port are the exact same size and the CSA throws brass over 10 feet straight up in the air. Mine is on its way to Movie Arms as we speak.
 
superlative said:
It's really easy to check. Get 2 drill bits: 2.6mm, and 2.4mm diameter. If the 2.4mm diameter drill bit fits in the gas hole, but the 2.6mm does not - then your rifle is within spec. The correct spec is 2.5mm.
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Not to sound stupid as math has never been a strong suit but what is that measure in imperial measurements ie. fractions of inches.
Secondly. The gas hole being measured is right off the barrel or the 2 holes side by side in the piston slide (can't think of the proper name right now)
 
2.4mm would be about 3/32; not sure if they make an Imperial bit the right size for 2.6mm. 7/64 would be more like 2.77mm...

The gas port is the one in the barrel. Not the bigger ones in the gas block.
 
Steve07 said:
2.4mm would be about 3/32; not sure if they make an Imperial bit the right size for 2.6mm. 7/64 would be more like 2.77mm...

The gas port is the one in the barrel. Not the bigger ones in the gas block.
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Okay next question. I noticed when I was measuring that the gas port appears to get bigger in diameter as it comes off the barrel. Do my eyes deceive me or is this true?
 
Steve07 said:
2.4mm would be about 3/32; not sure if they make an Imperial bit the right size for 2.6mm. 7/64 would be more like 2.77mm...

The gas port is the one in the barrel. Not the bigger ones in the gas block.
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?? I measured the ones in the gas block. The ones in the gas block are the ones that will directly impact the force of the piston.
 
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