Bren 2 9" FTE/Stovepipe issues

[Magsz]

Maybe I’m a dummy but I am wondering now if perhaps the issue lies in the conversion, and whether the bolt carrier is lighter than the FA version, but they left the gas ports sized the same? Perhaps the rail has nothing to do with it, but the round count does, and once it breaks in the bolt speed exceeds the functional range?

IF that’s the case then either a weight buffer of some sort, or decreased gas port size, or stronger return spring might help


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Good theory bud.  I think you're probably on to something there but i'm not sure if the weight difference on the FA version is significant.  I actually think the FA bolt may be lighter due to the cutout for the auto sear but that is PURE speculation.

I think CZ screwed the pooch with spring rates and gas port sizes, period.  The "butt dyno" leads me to believe that ALL barrel lengths use the same recoil spring rating as well as the 5.56 and 7.62X39 guns sharing the same.

Anyone that has spent ANY time around varied barrel lengths on any AR15 knows that there is no one size (rate) fits all optimal spring.

I can confirm that the recoil springs in my 9" 7.62x39 and 11" 5.56 are exactly the same, which seems strange.

I'm starting to think that another option we may be able to pursue on our own is drilling out the "0" setting on the gas port.  Start small, and work progressively larger.  Would have the added benefit of running better with a can too in theory.

Plenty of people have done this already.

My personal opinion is that its a bandaid fix and its pure bullcrap for us to have to physically modify our firearm in order for it to work.

Furthermore, if we DO drill the off setting, we are going to drill for one or two scenarios.  Either the gun will function without a can, or will STILL be over gassed WITH a can.  We aren't going to be able to have our cake and eat it too.

The gun's need gas port sizing revisions on more than just the gas regulator.

[shineboy2000]

I love the idea of drilling the 0 setting out, I’ll never use it anyway. My 5.56 11” is definitely over gased with a can on it.

[keefypants]

Anyone else try the BCM extractor spring without the doughnut and can say how long the extractor lasted?  I'm trying a few other things mentioned in this thread and others, but if issues continue, I want to try the spring, and failing that, sending it back in.

[Magsz]

I dont think anyone has tested that yet.  I believe the only person documenting their experiments with extractor springs was running the donut and the extractor claw sheared off after 400 rounds.

I have a BCM 5 coil spring kit on its way to me and will be testing it without the o-ring.

[czfanatic_]

I dont think anyone has tested that yet.  I believe the only person documenting their experiments with extractor springs was running the donut and the extractor claw sheared off after 400 rounds.

I have a BCM 5 coil spring kit on its way to me and will be testing it without the o-ring.

Yep, that was me, haha.  Stupid in hindsight, but hey, it was for science!

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[America_First]

Time to just install the BCM spring only and do some testing.  Just doing my own research, it seems that no one actually runs the o-ring. 

What's the status on CZ-USA and their handling of this fiasco? 

[czkyle1776]

Time to just install the BCM spring only and do some testing.  Just doing my own research, it seems that no one actually runs the o-ring. 

What's the status on CZ-USA and their handling of this fiasco?

From what I've been reading on here and reddit, their stance seems to be blame the customer.

[America_First]

Blame the customer for running commercial, mil-spec ammunition?

CZ is 'not looking good' (Rob Ski voice) at this point in time.  The (pistol) is beautiful, the machining and build quality of the actual components are second to none. 

It's incredibly sad to me that CZ-USA does not stand behind their product and attempt to find a solution.

[Mercs]

I’m certainly not above bashing a company for bad customer service, but I think we may need to be a bit more patient in this circumstance, only because of the fact the world has been basically shut down for the last 6 months


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[czkyle1776]

I’m certainly not above bashing a company for bad customer service, but I think we may need to be a bit more patient in this circumstance, only because of the fact the world has been basically shut down for the last 6 months


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Don't get me wrong, I'm not bashing the company. Those are just first hand reports of what CZ told them is wrong. I'm just repeating what they said the customers were doing wrong.

[MeatAxe]

I’m certainly not above bashing a company for bad customer service, but I think we may need to be a bit more patient in this circumstance, only because of the fact the world has been basically shut down for the last 6 months


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Don't get me wrong, I'm not bashing the company. Those are just first hand reports of what CZ told them is wrong. I'm just repeating what they said the customers were doing wrong.

Jeez, I'd hate to see CZ USA start turning into Ron Cohen's SIG USA (customer service mantra: "shooter error" -- and god forbid, using their customers as beta testers) -- Sig's lousy CS and BS attitude is what (thankfully) turned me off of Sig and got me to start shooting CZ pistols and then rifles!

[czfanatic_]

I'm giving CZ-USA a chance because I love CZ-UB.  I am starting to hate CZ-USA. 

Spent the past hour tearing my 9" apart to get it ready to send back. 

I've got well over ten grand worth of CZ firearms and it is like they don't even care that you are a loyal customer. 

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[keefypants]

I'm giving CZ-USA a chance because I love CZ-UB.  I am starting to hate CZ-USA. 

Spent the past hour tearing my 9" apart to get it ready to send back. 

I've got well over ten grand worth of CZ firearms and it is like they don't even care that you are a loyal customer. 

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How are you shipping the rifle back, in the og box?  The complete lack of spare parts and no news on when they will have any, has left my bren 2 in a not quite shootable state.  I have stripped screws on the bottom rail, and want fresh oem ones before I do any more shooting, and they don't have any spares, and I am seriously considering seeing if I is faster to get it sent back , if for nothing else, to get them to get me new screws.  This situation is so bleeping dumb.

[Magsz]

I'm giving CZ-USA a chance because I love CZ-UB.  I am starting to hate CZ-USA. 

Spent the past hour tearing my 9" apart to get it ready to send back. 

I've got well over ten grand worth of CZ firearms and it is like they don't even care that you are a loyal customer. 

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How are you shipping the rifle back, in the og box?  The complete lack of spare parts and no news on when they will have any, has left my bren 2 in a not quite shootable state.  I have stripped screws on the bottom rail, and want fresh oem ones before I do any more shooting, and they don't have any spares, and I am seriously considering seeing if I is faster to get it sent back , if for nothing else, to get them to get me new screws.  This situation is so bleeping dumb.

I shipped mine back in a Palmetto State Armory Rifle box with a cardboard outer box over that.

Measure your screws and go to mcmaster carr and get replacements.  Waiting on CZ is going to take eons.

[MeatAxe]

I'm giving CZ-USA a chance because I love CZ-UB.  I am starting to hate CZ-USA. 

Spent the past hour tearing my 9" apart to get it ready to send back. 

I've got well over ten grand worth of CZ firearms and it is like they don't even care that you are a loyal customer. 

Sent from my SM-N950U using Tapatalk

How are you shipping the rifle back, in the og box?  The complete lack of spare parts and no news on when they will have any, has left my bren 2 in a not quite shootable state.  I have stripped screws on the bottom rail, and want fresh oem ones before I do any more shooting, and they don't have any spares, and I am seriously considering seeing if I is faster to get it sent back , if for nothing else, to get them to get me new screws.  This situation is so bleeping dumb.

I shipped mine back in a Palmetto State Armory Rifle box with a cardboard outer box over that.

Measure your screws and go to mcmaster carr and get replacements.  Waiting on CZ is going to take eons.

You can also get the screws and Nord Lock washers (don’t forget those) at Fastenal.