POLL: 7.62x39 Bren 2 Failures to Extract / Eject / Stovepipes -- Or Not

[Archos]

CZ can choose to sweep the issue under the rug and reference a "successful" video like MAC's....

Not a single person here is saying that CZ is sweeping the issue under the rug.

OK.


I'm not saying your gun doesn't have a problem. I'm not saying you don't have a right to be upset. I'm not saying you don't have a right to voice your disapproval.

All I'm saying is this thread reads like there's a giant conspiracy to cover up a single issue with one model. While I agree several owners are having trouble, no one has proved it's all related to a single item. While several guns fail to eject, there are so many contributors to proper ejection that 7 guns could all have 7 completely un-related causes which all result in the same outcome.

Secondly, while "blowing off steam" may feel good, it is unproductive. This forum has a friendly relationship with CZUSA, but we are in no way associated with CZ, CZUSA or any affiliate. There is no evidence that anyone from CZUSA monitors these threads... ever. If you want to take action that has real hopes of getting a result, then I suggest you call CZUSA, form a relationship with one of their appropriate representatives, and send them a video of your gun having the issue. That way they can see it for themselves. If you can demo the same issue with several brands of ammunition then you have a real chance of them taking positive action.

But if you're posting words and photos here hoping to get CZ's attention, it just ain't gonna happen. 

Both time my pistol has been to CZ I included a detailed narration of the malfunctions I was experiencing, with the narration I included  the web address to my video of the pistol malfunctioning. I also included a link when I filled out the warranty claim, both times. Not once have they ever acknowledged even watching it. I posted after the rep on reddit and he responded with questions that were answered in my first post. I want my gun to be fixed, but when you provide the same link multiple times and answer the same questions over and over your faith in the company begins to be tested.

Dont get me wrong, I'm going to continue to work with them and see the issue to its end, but you can see how I might be rather upset .

[Mercs]

On today menu for the 11” Bren 2s, we have many various 7.62x39 rounds. I may not get to shoot it all, but will report back later on the results

[America_First]

😎 looks real fun!  I'll be at the range on Monday.

[Mercs]

So I had time to put another 270 rounds of various steel case down range. I experienced 0 failures. Shells throughout the range of loadings I shot are ejecting pretty consistently about 6 feet forward at about 1:30 on the clock, with a few of them bouncing off of the front of the ejection port and flipping forward only a couple feet.

The gun is punchy, and feels a bit overgassed. I would expect that from a military rifle. However I would also rather slow down the bolt speed a bit based on the recoil impulse and the ejection pattern, as well as the casings hitting the front of the ejection port. I took photos of my ejection port, bolt, and the gas regulator. Here is the exact round count:

2020 Bren 2s 11” 7.62x39

Brass:
120 rds Geco Target

Steel:
60 rds Golden Tiger 124gr FMJ
60 rds Red Army Standard 124gr 8V3 HP
60 Tulammo Range Friendly 122gr FMJ
30 rds Barnaul 123gr HP
30 rds Tulammo 154gr SP
30 rds Wolf 124gr 8M3 HP

Total rounds fired: 390
Failure Count: 0









Sent from my iPhone using Tapatalk

[MeatAxe]

^ Thanks for posting that - I've had zero malfunctions (knock on wood) with the same or similar Russian steel cased ammo plus US ballistic tips. Mine doesn't seem to care for SPs in general, not good accuracy, probably because it mashes the SP tip when chambering, but still functions without fail this far. So, I'm gonna call BS on the "shoddy ammo" theory, more likely some shoddy QC at CZ when they drilled the gas ports.

I'm not sure that the Bren 2 is punchy because it's overgassed (at least the ones that aren't having FTE problems) as it is that they kick more because they're so light. Similar sized pistols, the Zastava ZPAP weighs 6.6 pounds, a SAM7k milled AK, I'm going to guess weighs over 8 pounds, fitted with the usual heavy duty steel surplus AK mags are going to be significantly heavier than a Bren 2 at 5.6 pounds with lightweight plastic CZ or aluminum AR magazines.

Looking at the poll, we've gotta have more than just 14 Bren 2 owners on this board! 

[Rheverly]

Looking at the poll, we've gotta have more than just 14 Bren 2 owners on this board! 

I just got an 11” about 10 days ago. I’ve only had time to put 2 boxes of Red Army Standard through it (no issues) but it’s too soon for me to vote. I could vote no issues but that wouldn’t be fair this early in the game. I’ll report back after more range trips.

I was hoping to pick up the HBI extended handguard, but now thinking maybe not. Doesn’t matter, they’re out of stock, maybe for redesign.

[357MAGNOLE]

So is anyone in the know on if CZ will be addressing the over-gassing issue or will it not be considered an issue since it is a military weapon?  I have been wanting to get one of these for a while, but now I feel like I need to wait until CZ address's the issues. Im also wanting to run this suppressed, and concerned about the impact of that as well.

[Magsz]

So is anyone in the know on if CZ will be addressing the over-gassing issue or will it not be considered an issue since it is a military weapon?  I have been wanting to get one of these for a while, but now I feel like I need to wait until CZ address's the issues. Im also wanting to run this suppressed, and concerned about the impact of that as well.

That is all up in the air.

For all we know, CZ designed the gun around these gas port sizes to operate as it does.  They may say "nope, this is how it was designed and is functioning as it should".

We will have to see.  As it stands, there are a few work arounds.  You can go ahead and drill your own port size or you can get a flow through suppressor design.

[America_First]

Sadly, fired 120 rounds again today.  8 FTE's.  Videos will be up later on ARFCOM.

[Rheverly]

So is anyone in the know on if CZ will be addressing the over-gassing issue or will it not be considered an issue since it is a military weapon?  I have been wanting to get one of these for a while, but now I feel like I need to wait until CZ address's the issues. Im also wanting to run this suppressed, and concerned about the impact of that as well.

I took mine to the range this morning and ran it suppressed for the first time. I have the 11”. I’m using the Sig SRD762QD. I ran 100 rounds of wolf polyformance with zero issues. I also ran 40 rounds of golden bear subs. Using subs there were some cycling issues that were corrected by switching to the adverse setting.

Talking to my buddy at the range he told me if I have issues I could have the gas plug drilled and tapped and that Parker mountain machine sells set screws that are drilled out to various sizes for such an application on the SCAR. The screws are about $7 each but can be had in a variety of hole sizes and there is a big thread on ar15.com with data about ideal port size for various barrel lengths. This sounds like a possible solution to fine tune the gas.

On a side note, when shooting suppressed with full power ammo there were some small flames from the gas plug area.
Rob

[dkozy]

So is anyone in the know on if CZ will be addressing the over-gassing issue or will it not be considered an issue since it is a military weapon?  I have been wanting to get one of these for a while, but now I feel like I need to wait until CZ address's the issues. Im also wanting to run this suppressed, and concerned about the impact of that as well.

I took mine to the range this morning and ran it suppressed for the first time. I have the 11”. I’m using the Sig SRD762QD. I ran 100 rounds of wolf polyformance with zero issues. I also ran 40 rounds of golden bear subs. Using subs there were some cycling issues that were corrected by switching to the adverse setting.

Talking to my buddy at the range he told me if I have issues I could have the gas plug drilled and tapped and that Parker mountain machine sells set screws that are drilled out to various sizes for such an application on the SCAR. The screws are about $7 each but can be had in a variety of hole sizes and there is a big thread on ar15.com with data about ideal port size for various barrel lengths. This sounds like a possible solution to fine tune the gas.

On a side note, when shooting suppressed with full power ammo there were some small flames from the gas plug area.
Rob

Can you post a link for this? Id really like to have the "0" spot tapped for this to give it a try as I plan to run an OSS suppressor on mine.

Hello all! I have a "20" bolt and have had no failures yet. All brass ammo though but I have 1000rds of steel wolf stuff coming so ill try that out. Its a recently purchased 9" 7.62 with HBI everything. The hand guard is the 7.8" model. So far i love it but haven't had much time to shoot or find ammo. Magazines are a whole other issue. 

[dkozy]

To anyone that sees this and has a HBI hand guard have you pulled out your recoil spring and tested to see if your bolt cycles freely? When I initially put the handguard on mine bound up pretty bad to the point it was almost jammed in there. I didn't like HBI's response of 45inlbs for such an important piece. I then began trouble shooting and found that flipping the bolt plates and re-torquing everything to 70inlbs did the trick. They then sent me new bolt plates with hardware and washers (thanks HBI) but when i assembled it up it was that same issue. This time I decided to mess with it using different torque sequences and eventually it torqued properly to 70inlbs and no binding what so ever. Im talking about removing the recoil spring and the bolt moves completely butter smooth. Im curious if some of you that have issues are cycling it and thinking its smooth but with the recoil spring in it can "hide" a little binding in the receiver as this happen to me. At one point i assembled everything and thought nice it works and pull the spring out and it was still binding. When I watched a video in the other thread of the guys stove pipe it seriously looked like the bolt was binding. Could have been just bit dirty but when he sent the bolt home it look like it was barely making it home. Almost look "crunchy". Anyway just my thoughts. I joined the forum as i found out about this from recently buying a "20" model MS that has a 20 bolt. I have 1000rds of wolf on the way and will let you know what the results are in a few weeks.     

[MeatAxe]

So is anyone in the know on if CZ will be addressing the over-gassing issue or will it not be considered an issue since it is a military weapon?  I have been wanting to get one of these for a while, but now I feel like I need to wait until CZ address's the issues. Im also wanting to run this suppressed, and concerned about the impact of that as well.

I took mine to the range this morning and ran it suppressed for the first time. I have the 11”. I’m using the Sig SRD762QD. I ran 100 rounds of wolf polyformance with zero issues. I also ran 40 rounds of golden bear subs. Using subs there were some cycling issues that were corrected by switching to the adverse setting.

Talking to my buddy at the range he told me if I have issues I could have the gas plug drilled and tapped and that Parker mountain machine sells set screws that are drilled out to various sizes for such an application on the SCAR. The screws are about $7 each but can be had in a variety of hole sizes and there is a big thread on ar15.com with data about ideal port size for various barrel lengths. This sounds like a possible solution to fine tune the gas.

On a side note, when shooting suppressed with full power ammo there were some small flames from the gas plug area.
Rob

Can you post a link for this? Id really like to have the "0" spot tapped for this to give it a try as I plan to run an OSS suppressor on mine.

Hello all! I have a "20" bolt and have had no failures yet. All brass ammo though but I have 1000rds of steel wolf stuff coming so ill try that out. Its a recently purchased 9" 7.62 with HBI everything. The hand guard is the 7.8" model. So far i love it but haven't had much time to shoot or find ammo. Magazines are a whole other issue.

It's too bad that the Bren 2 (and most other such guns) don't have an FAL style gas regulator with multiple orifices that you can just dial in at will.  Maybe somebody will come up with such in the aftermarket, but we can't even get spare gas plugs to play with (or ANY spare parts) from CZ USA at this point, which is ridiculous.

This is the Parker Mountain thing for the SCAR, they also have multiple gas jets for sale with different orifice sizes. Quite a system but looks like that would be quite a job to screw with to get it to work on a Bren 2.

https://www.parkermountainmachine.com/store/p464/Scar_16%2F17%2F20%2FSC__Gas_Jet_Tool.html

[dkozy]

So is anyone in the know on if CZ will be addressing the over-gassing issue or will it not be considered an issue since it is a military weapon?  I have been wanting to get one of these for a while, but now I feel like I need to wait until CZ address's the issues. Im also wanting to run this suppressed, and concerned about the impact of that as well.

I took mine to the range this morning and ran it suppressed for the first time. I have the 11”. I’m using the Sig SRD762QD. I ran 100 rounds of wolf polyformance with zero issues. I also ran 40 rounds of golden bear subs. Using subs there were some cycling issues that were corrected by switching to the adverse setting.

Talking to my buddy at the range he told me if I have issues I could have the gas plug drilled and tapped and that Parker mountain machine sells set screws that are drilled out to various sizes for such an application on the SCAR. The screws are about $7 each but can be had in a variety of hole sizes and there is a big thread on ar15.com with data about ideal port size for various barrel lengths. This sounds like a possible solution to fine tune the gas.

On a side note, when shooting suppressed with full power ammo there were some small flames from the gas plug area.
Rob

Can you post a link for this? Id really like to have the "0" spot tapped for this to give it a try as I plan to run an OSS suppressor on mine.

Hello all! I have a "20" bolt and have had no failures yet. All brass ammo though but I have 1000rds of steel wolf stuff coming so ill try that out. Its a recently purchased 9" 7.62 with HBI everything. The hand guard is the 7.8" model. So far i love it but haven't had much time to shoot or find ammo. Magazines are a whole other issue.

It's too bad that the Bren 2 (and most other such guns) don't have an FAL style gas regulator with multiple orifices that you can just dial in at will.  Maybe somebody will come up with such in the aftermarket, but we can't even get spare gas plugs to play with (or ANY spare parts) from CZ USA at this point, which is ridiculous.

This is the Parker Mountain thing for the SCAR, they also have multiple gas jets for sale with different orifice sizes. Quite a system but looks like that would be quite a job to screw with to get it to work on a Bren 2.

https://www.parkermountainmachine.com/store/p464/Scar_16%2F17%2F20%2FSC__Gas_Jet_Tool.html

Interesting, I think all id need to do is actually drill out the #2 adverse hole large enough to get a set screw like that tapped in there and run it flush to the selector. That would give you the option to drill it out larger and larger tell you figure out what works best. I dont think thatd be to hard of a procedure.

[Rheverly]

So is anyone in the know on if CZ will be addressing the over-gassing issue or will it not be considered an issue since it is a military weapon?  I have been wanting to get one of these for a while, but now I feel like I need to wait until CZ address's the issues. Im also wanting to run this suppressed, and concerned about the impact of that as well.

I took mine to the range this morning and ran it suppressed for the first time. I have the 11”. I’m using the Sig SRD762QD. I ran 100 rounds of wolf polyformance with zero issues. I also ran 40 rounds of golden bear subs. Using subs there were some cycling issues that were corrected by switching to the adverse setting.

Talking to my buddy at the range he told me if I have issues I could have the gas plug drilled and tapped and that Parker mountain machine sells set screws that are drilled out to various sizes for such an application on the SCAR. The screws are about $7 each but can be had in a variety of hole sizes and there is a big thread on ar15.com with data about ideal port size for various barrel lengths. This sounds like a possible solution to fine tune the gas.

On a side note, when shooting suppressed with full power ammo there were some small flames from the gas plug area.
Rob

Can you post a link for this? Id really like to have the "0" spot tapped for this to give it a try as I plan to run an OSS suppressor on mine.

Hello all! I have a "20" bolt and have had no failures yet. All brass ammo though but I have 1000rds of steel wolf stuff coming so ill try that out. Its a recently purchased 9" 7.62 with HBI everything. The hand guard is the 7.8" model. So far i love it but haven't had much time to shoot or find ammo. Magazines are a whole other issue.

It's too bad that the Bren 2 (and most other such guns) don't have an FAL style gas regulator with multiple orifices that you can just dial in at will.  Maybe somebody will come up with such in the aftermarket, but we can't even get spare gas plugs to play with (or ANY spare parts) from CZ USA at this point, which is ridiculous.

This is the Parker Mountain thing for the SCAR, they also have multiple gas jets for sale with different orifice sizes. Quite a system but looks like that would be quite a job to screw with to get it to work on a Bren 2.

https://www.parkermountainmachine.com/store/p464/Scar_16%2F17%2F20%2FSC__Gas_Jet_Tool.html

Interesting, I think all id need to do is actually drill out the #2 adverse hole large enough to get a set screw like that tapped in there and run it flush to the selector. That would give you the option to drill it out larger and larger tell you figure out what works best. I dont think thatd be to hard of a procedure.

I’ve been told it’s about a $25 job got a competent gunsmith.