Right down to the nitty gritty of it - I own a CSA VZ58 non restricted 18.5 incher in 7.62x39 that is no longer under warranty and I'm concerned about the enlarged gas port and possible bolt-carrier group cracking under use. Is there any DIY solutions to preventing this from occurring? I contacted CSA and after a quick range session and correspondence they figured my rifle was "acceptable" - I'm just worried about further down the line.
CSA VZ58 7.62x39 Overgassing solutions?
- Thread starter NilRecurring
- Start date
Cases were ejecting within a meter. I contacted CSA and they said my serial number was among the affected batch.
"There were indeed several batches of our rifles with incorrect gas holes drilled, however, vast majority of them were in 5.56 calibre. Your rifle, going by the serial number, has a gas hole drilled slightly larger than usual (yours is 3.0 mm, standard is 2.5 mm), however it may still be perfectly alright, depending on the gas block diameter and piston diameter combination."
"You can easily check yourself by watching the empty cases ejections. If your empty cases, during firing, fly some 1.5 – 3.5 metres away from the rifle, everything is fine. If they eject 4-6 meters far, the rifle still may do many thousands of rounds without anything breaking, but I would suggest sending the rifle to our warranty station in order to swap the piston for the one with slightly smaller diameter. If your rifle ejects cases 7-10 meters far, it definitely needs to be send for piston replacement."
"There were indeed several batches of our rifles with incorrect gas holes drilled, however, vast majority of them were in 5.56 calibre. Your rifle, going by the serial number, has a gas hole drilled slightly larger than usual (yours is 3.0 mm, standard is 2.5 mm), however it may still be perfectly alright, depending on the gas block diameter and piston diameter combination."
"You can easily check yourself by watching the empty cases ejections. If your empty cases, during firing, fly some 1.5 – 3.5 metres away from the rifle, everything is fine. If they eject 4-6 meters far, the rifle still may do many thousands of rounds without anything breaking, but I would suggest sending the rifle to our warranty station in order to swap the piston for the one with slightly smaller diameter. If your rifle ejects cases 7-10 meters far, it definitely needs to be send for piston replacement."
maybe csa has a different size hole then cz? mine are all larger then 2.5mm (closer to 3mm). from the looks of mine i would say if you can fit a 1/8 drill bit down the gas hole its to big. sorry i dont have a better way to measure mine right now but a 1/8 (3.175mm) bit is close to fitting but slightly to big. and a 7/64 (2.778mm) bit is loose as can be in the gas hole.
Probably part of what makes them work every time you pull the trigger. Mine launches cases at the roof at the range with some real authority, love it. i don't know how you would ever measure it without a gun smith spending some time taking the gas block off. I'd say letter buck. Thoes rifles r fairly hard to find a and r worth a bit used so if I was going to do anything I'd sell it local to someone that cant find one in a store and then source one online. You could spend more then it's worth all to find out it's good or will need more money tossed at it.
Factory Warranty is 5 years on new CSA VZ58's. Speak to Movie Arms, they'll fix it up for you.
Mumbles Marble Mouth
CGN Ultra frequent flyer
- Location
- Lower Mainland
If CSA says its okay, then its okay. Don't #### with it. If it had the over gassed issue, it wouldn't of survived the 5 years of warranty without something happening.
Movie Arms is no longer doing the warranty work, North Sylva is. If your brass isn't coming out of the gun at near lethal velocities, I'd say there isn't an issue. All east Bloc firearms (especially military designs) eject pretty hard, but unless there's a good chance of taking out the guy next to you with a casing, I wouldn't worry.
Your OCD is kicking in again.
If you're ejecting empty cases 1-1.5 meters consistently your rifle is not over-gassed...end of story. It is also not a problem that develops over time or is exacerbated by round count. It is simply affected right off the assembly line or it is not.
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With a little over 3 feet in a meter I'd say you're within spec.
Can't believe how much needless worry this topic produces, CSA gives a specification in meters and it's like we're talking about thousandths of an inch or something.
I'm not singling you out tnsaf...no one wants to be stuck with a roach but I think far fewer rifles left the factory with oversized ports then we are led to believe.
