Bren 2 9" FTE/Stovepipe issues

[shineboy2000]

So glad at this point I bought a 556, it was close though!!

[Gman86]

I have a 2019 14 inch bren 2ms in 7.62×39. My gun was very overgassed or so I thought. The gun was ejecting straight forward or if I was lucky at 1o clock and just barely clearing the ejection port. It would jam every 3 to 5 rounds. Well I finally got my hands on an 11inch 5.56 gas plug or tube to try in my 14 inch 7.62 gun and it works perfectly. Ejection is at 3o clock on setting 1 and slightly forward at 2:30 to 2 o clock on the adverse setting or setting 2. My gun is fixed. No drilling of gas ports needed. Hope this helps someone because cz sure isn't. All ammo used to test was wolf military classic 124gr hp. Also tried S&B brass cased soft points as well as ppu brass case soft points and wolf 123 gr fmj.

[MeatAxe]

I have a 2019 14 inch bren 2ms in 7.62×39. My gun was very overgassed or so I thought. The gun was ejecting straight forward or if I was lucky at 1o clock and just barely clearing the ejection port. It would jam every 3 to 5 rounds. Well I finally got my hands on an 11inch 5.56 gas plug or tube to try in my 14 inch 7.62 gun and it works perfectly. Ejection is at 3o clock on setting 1 and slightly forward at 2:30 to 2 o clock on the adverse setting or setting 2. My gun is fixed. No drilling of gas ports needed. Hope this helps someone because cz sure isn't. All ammo used to test was wolf military classic 124gr hp. Also tried S&B brass cased soft points as well as ppu brass case soft points and wolf 123 gr fmj.

How did you get your hands on an 11” 5.56 gas tube? That’s been the main problem with CZ - no spare parts.

Can you measure the gas port sizes on both gas tubes with a caliper and let us know?

Thanks!

[Gman86]

I got mine from the European webstore.  I think for the 11inch 5.56 setting 1 is around 1.2ish mm and setting 2 is 1.5ish mm.  I also am 99% sure the 8 inch 5.56 gas tube would work as well in the 14 inch 7.62. I think the measurements on the 8 inch 5.56 is setting 1   1.15mm and setting 2 is 1.44mm. The dwell time in the 14inch 7.62 is ridiculous. The gas tube ports in my original 7.62 14 inch plug were so ridiculously oversized I didn't bother to measure lol. My best guess at the original plug hole sizes were setting 1  1.6/1.7mm and setting 2  1.8/1.9mm... way too big for that amount of dwell time in the 14 inch barrel.  I am a mechanical engineer and this is just my 2 cents... I think most people are experiencing the same exact or very similar malfunctions it is just everyone interprets the malfunctions slightly different.  I do not believe it is a widespread extractor/ejector spring issue but I'm not denying very few could have "out of spec" springs but I don't believe it is the main culprit plaguing these firearms. With all the research I have conducted I think the problem is with the gas port location being the same for all barrel lengths. I have noticed less problems with the shorter length 8 and 11 inch barrels. As the dwell time increases in the longer 11 and 14 inch barrels the bolt velocity becomes too much for this "modular" design. You also have to consider that an empty 7.62 case is rear or primer heavy when spent and has a hard enough time "swinging" the case mouth out while ejecting.  All the weight being near the primer wants to keep it planted in place during a high bolt velocity scenario. Slow the bolt velocity down and give the light ended case mouth time to swing out adequately enough for reliable ejection. A heavy extractor/ejector spring would help this issue but i believe it is a bandaid to the real problem and will only result in more broken extractors. Again just my 2 cents from what I have researched.

[MeatAxe]

I got mine from the European webstore.  I think for the 11inch 5.56 setting 1 is around 1.2ish mm and setting 2 is 1.5ish mm.  I also am 99% sure the 8 inch 5.56 gas tube would work as well in the 14 inch 7.62. I think the measurements on the 8 inch 5.56 is setting 1   1.15mm and setting 2 is 1.44mm. The dwell time in the 14inch 7.62 is ridiculous. The gas tube ports in my original 7.62 14 inch plug were so ridiculously oversized I didn't bother to measure lol. My best guess at the original plug hole sizes were setting 1  1.6/1.7mm and setting 2  1.8/1.9mm... way too big for that amount of dwell time in the 14 inch barrel.  I am a mechanical engineer and this is just my 2 cents... I think most people are experiencing the same exact or very similar malfunctions it is just everyone interprets the malfunctions slightly different.  I do not believe it is a widespread extractor/ejector spring issue but I'm not denying very few could have "out of spec" springs but I don't believe it is the main culprit plaguing these firearms. With all the research I have conducted I think the problem is with the gas port location being the same for all barrel lengths. I have noticed less problems with the shorter length 8 and 11 inch barrels. As the dwell time increases in the longer 11 and 14 inch barrels the bolt velocity becomes too much for this "modular" design. You also have to consider that an empty 7.62 case is rear or primer heavy when spent and has a hard enough time "swinging" the case mouth out while ejecting.  All the weight being near the primer wants to keep it planted in place during a high bolt velocity scenario. Slow the bolt velocity down and give the light ended case mouth time to swing out adequately enough for reliable ejection. A heavy extractor/ejector spring would help this issue but i believe it is a bandaid to the real problem and will only result in more broken extractors. Again just my 2 cents from what I have researched.

Interesting! Thanks for that info!

I’m no engineer, but I think you’re right about the issues of the x39 Bren 2. Do you have a link to the European web store? I could not find any gas tubes for sale at CZ UB.

Thanks!

[alex33x]

I got mine from the European webstore.  I think for the 11inch 5.56 setting 1 is around 1.2ish mm and setting 2 is 1.5ish mm.  I also am 99% sure the 8 inch 5.56 gas tube would work as well in the 14 inch 7.62. I think the measurements on the 8 inch 5.56 is setting 1   1.15mm and setting 2 is 1.44mm. The dwell time in the 14inch 7.62 is ridiculous. The gas tube ports in my original 7.62 14 inch plug were so ridiculously oversized I didn't bother to measure lol. My best guess at the original plug hole sizes were setting 1  1.6/1.7mm and setting 2  1.8/1.9mm... way too big for that amount of dwell time in the 14 inch barrel.  I am a mechanical engineer and this is just my 2 cents... I think most people are experiencing the same exact or very similar malfunctions it is just everyone interprets the malfunctions slightly different.  I do not believe it is a widespread extractor/ejector spring issue but I'm not denying very few could have "out of spec" springs but I don't believe it is the main culprit plaguing these firearms. With all the research I have conducted I think the problem is with the gas port location being the same for all barrel lengths. I have noticed less problems with the shorter length 8 and 11 inch barrels. As the dwell time increases in the longer 11 and 14 inch barrels the bolt velocity becomes too much for this "modular" design. You also have to consider that an empty 7.62 case is rear or primer heavy when spent and has a hard enough time "swinging" the case mouth out while ejecting.  All the weight being near the primer wants to keep it planted in place during a high bolt velocity scenario. Slow the bolt velocity down and give the light ended case mouth time to swing out adequately enough for reliable ejection. A heavy extractor/ejector spring would help this issue but i believe it is a bandaid to the real problem and will only result in more broken extractors. Again just my 2 cents from what I have researched.

How did you manage to buy one from the European webstore? I tried going this route, but once you get it in your cart there is no way to check out.

[Aries144]

I think the legal situation in Czech Republic changed recently. I was told that they can't send any main components outside of the EU. This doesn't include the stock, but does include thigns like firing pins and the gas cylinder, unfortunately.

[MeatAxe]

I think the legal situation in Czech Republic changed recently. I was told that they can't send any main components outside of the EU. This doesn't include the stock, but does include thigns like firing pins and the gas cylinder, unfortunately.

Have you got a link to that? They sure are sending complete guns, including the Bren 2, even though they aren’t sending spare parts (which I assume are being used to assemble complete guns, which are flying off the shelves at premium prices during this panic).

[Aries144]

I contacted the owner of cz-parts.com about getting some things like firing pins, recoil springs, gas cylinders and etc. Here is his response: "Unfortunately these parts are not possible for us to supply outside of Europe because of local legislation regarding these parts as main parts of a rifle."

I believe this has changed recently, as it was possible to occasionally obtain them as late as last year. I also understand that CR has recently had some of their gun laws change due to pressure from the EU to adopt EU-wide firearms policy.

[alex33x]

Is there still no response from CZ regarding the FTE Issues on the 7.62 version of the gun? I tried to get a third whole drilled on my gas regulator but nobody in my Area, is even brave enough to try.

[MeatAxe]

Is there still no response from CZ regarding the FTE Issues on the 7.62 version of the gun? I tried to get a third whole drilled on my gas regulator but nobody in my Area, is even brave enough to try.

You should contact HBI, they provide a service to drill the third hole and replace the piston spring for @ $60.

[scotheocelot]

Is there still no response from CZ regarding the FTE Issues on the 7.62 version of the gun? I tried to get a third whole drilled on my gas regulator but nobody in my Area, is even brave enough to try.

You should contact HBI, they provide a service to drill the third hole and replace the piston spring for @ $60.

Best money spent on my setup. Suppressed shooting results in consistent 3 O’clock ejection pattern. 


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[scotheocelot]

I contacted the owner of cz-parts.com about getting some things like firing pins, recoil springs, gas cylinders and etc. Here is his response: "Unfortunately these parts are not possible for us to supply outside of Europe because of local legislation regarding these parts as main parts of a rifle."

I believe this has changed recently, as it was possible to occasionally obtain them as late as last year. I also understand that CR has recently had some of their gun laws change due to pressure from the EU to adopt EU-wide firearms policy.

Uuummm...come again? How is it CZ can ship entire pistols but cannot ship replacement parts?  Something isn’t adding up.


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[MeatAxe]

I contacted the owner of cz-parts.com about getting some things like firing pins, recoil springs, gas cylinders and etc. Here is his response: "Unfortunately these parts are not possible for us to supply outside of Europe because of local legislation regarding these parts as main parts of a rifle."

I believe this has changed recently, as it was possible to occasionally obtain them as late as last year. I also understand that CR has recently had some of their gun laws change due to pressure from the EU to adopt EU-wide firearms policy.

Uuummm...come again? How is it CZ can ship entire pistols but cannot ship replacement parts?  Something isn’t adding up.


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I’m sure CZ wants to sell as many complete guns as they can right now, ahead of any possible AWB, and then service and sell parts when / if things calm down.

[Aries144]

Uuummm...come again? How is it CZ can ship entire pistols but cannot ship replacement parts?  Something isn’t adding up.

CZ-parts.com is not affiliated with CZ. They just sell parts. They're based in Europe, and so are bound by new EU laws that strictly regulate certain firearm parts.