CZ Bren 2 MS NON-Restricted MAJOR UPDATE Post 587

Super short handguard with a goofy 20ish" barrel/muzzle device combo is a no go for me and I assume the 11" gas block location won't allow for anything longer at a later date?
I just saw the email tonight so missed out I guess. I'd go for the 16" conversion no problem as I wouldn't mind having a 16" spare barrel anyway. Guess I may just continue to wait in vain for the elusive factory rifle, haha. Man, I was getting excited as June approaches .. after waiting patiently since last June when I ordered.
I'll give a quick call to verify a few details but maybe there will be another rifle soon for someone who wants.
Liberals ruin everything.
 
Dlask Arms said:
I'll chime in here for a second...if anyone local wants to save the shipping and pick up their rifle in person they are free to. I have spoken with John at Marstar and told him this is OK with us provided you can be patient and let us work. Marstar will contact you when your rifle is done and ready then you call us to arrange a time. Not a problem.

The barrels are going to be awesome. We have ordered and paid for them and you guys will love them, promise. As for the difference of short vs. long gas system it makes zero difference. We have converted every type CZ makes (except the elusive 14 inch 5.56) and they cycle and function perfectly, no need to worry. This isn't the first EVER piston gun and certainly not the first we have converted.

With the short gas system it is possible to have the option of much different barrel lengths should you choose to swap barrels in the future. With the 16.5 inch you can only go between that and 18.5 inches so two inches difference, what's the point in that, lol.

Off to work I go, you all have a fantastic weekend.
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That is awesome. Thanks. Will definitely arrange that.
 
Sniffer said:
Pretty confident that CZ did extensive testing before deciding that there would be a different gas system on the "short" rifles vs the "long" rifles. Logically they must have saw something that made them want a different gas system on each. What that was I dont know - but there was / is a reason.

Will the short gas system work on one of the longer converted rifles - it certainly seems like that is the case based on your feedback (and others). I sense you are more than happy with your choice and I respect that. As I mentioned perviously I feel like I want the longer gas system as that was the system the manufacturer chose / designed into their rifles in the longer configuration.

I am still undecided with what to do with my order but fortunately I have other rifles to fill the role in the meantime.
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Just by eyeballing from photos, the 11" barreled rifles has about 4 inches between the gas port to the end of the rifled portion of the barrel.

When you convert it to NR, you're adding at least another 7.5 inches onto the end. So now you've nearly tripled the barrel length after the gas port. The duration for which the gas system gets pressurized is almost tripled for each shot fired, which makes the gun massively over-gassed. This causes the bolt carrier to cycle more violently, produces more recoil, unnecessary wear, etc. The factory gas regulator only has a normal, adverse, and off setting. So you can't just dial it down either.

On the other hand, the 16.5 barreled Bren 2 has about 6 inches of barrel length between the gas port and the muzzle. The added 2 inches to make it NR only makes it 33% over-gassed, rather than the nearly 200% if you converted a 11" rifle.
 
Well done Marstar and Dlask in following thru.

Most suppliers would have said #### it. Its not worth the hassle.

Top notch determination. For me this is a special rifle and a good #### you to Justin.

Well done to all those involved. I know how much work this would be. Worth every penny.
 
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Feminist said:
Just by eyeballing from photos, the 11" barreled rifles has about 4 inches between the gas port to the end of the rifled portion of the barrel.

When you convert it to NR, you're adding at least another 7.5 inches onto the end. So now you've nearly tripled the barrel length after the gas port. The duration for which the gas system gets pressurized is almost tripled for each shot fired, which makes the gun massively over-gassed. This causes the bolt carrier to cycle more violently, produces more recoil, unnecessary wear, etc. The factory gas regulator only has a normal, adverse, and off setting. So you can't just dial it down either.

On the other hand, the 16.5 barreled Bren 2 has about 6 inches of barrel length between the gas port and the muzzle. The added 2 inches to make it NR only makes it 33% over-gassed, rather than the nearly 200% if you converted a 11" rifle.
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This is working off of the assumption that the gas port size on the barrel is the same size regardless of the Barrell length?

From having multiple rifles caliber converted with different barrel lengths and gas systems, I can tell you that the gas port size on the barrel being different is absolutely necessary for correct operation when the rifle does not have an aftermarket adj gas block.
 
Brian46 said:
This is working off of the assumption that the gas port size on the barrel is the same size regardless of the Barrell length?

From having multiple rifles caliber converted with different barrel lengths and gas systems, I can tell you that the gas port size on the barrel being different is absolutely necessary for correct operation when the rifle does not have an aftermarket adj gas block.
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Makes sense.

I still question why CZ didnt just tweak the gas port size for different lengths of barrel as you mention instead of designing / manufacturing two different gas systems for the long or short versions of the rifle, it would have been much simpler / cheaper for them?
 
Feminist said:
Just by eyeballing from photos, the 11" barreled rifles has about 4 inches between the gas port to the end of the rifled portion of the barrel.

When you convert it to NR, you're adding at least another 7.5 inches onto the end. So now you've nearly tripled the barrel length after the gas port. The duration for which the gas system gets pressurized is almost tripled for each shot fired, which makes the gun massively over-gassed. This causes the bolt carrier to cycle more violently, produces more recoil, unnecessary wear, etc. The factory gas regulator only has a normal, adverse, and off setting. So you can't just dial it down either.

On the other hand, the 16.5 barreled Bren 2 has about 6 inches of barrel length between the gas port and the muzzle. The added 2 inches to make it NR only makes it 33% over-gassed, rather than the nearly 200% if you converted a 11" rifle.
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Curious to hear Dlasks thoughts on this.

I know they mentioned that each version of the rifle (long or short) cycled fine after conversion but if the rifle is crazy overgassed it will run but at what cost to longevity.
 
Sniffer said:
Makes sense.

I still question why CZ didnt just tweak the gas port size for different lengths of barrel as you mention instead of designing / manufacturing two different gas systems for the long or short versions of the rifle, it would have been much simpler / cheaper for them?
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Because you can’t have a 9” barrel with a 10” gas system, and if you have a 16” barrel it’s nice to have the rail space to go with it without Burying access to the regulator under the handguard.
 
rberresheim said:
Because you can’t have a 9” barrel with a 10” gas system, and if you have a 16” barrel it’s nice to have the rail space to go with it without Burying access to the regulator under the handguard.
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You mean like would be the case if you converted an 11" to NR length for example?
 
Brian46 said:
This is working off of the assumption that the gas port size on the barrel is the same size regardless of the Barrell length?

From having multiple rifles caliber converted with different barrel lengths and gas systems, I can tell you that the gas port size on the barrel being different is absolutely necessary for correct operation when the rifle does not have an aftermarket adj gas block.
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Come to think of it, why aren't adjustable gas blocks more popular on piston guns?

The Bren has basic adjustability but its just that - basic. I think I read that TNA was doing something about the WK180 but I cant bring myself to go down that rabbit hole.
 
Dlask Arms said:
Oh...also :

View attachment 667192

View attachment 667193

First batch arrived. We will be getting at these asap to strip them down and ready for conversion the minute the barrels arrive.
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CZ USA boxes

So are we getting American brens now? Not that it's the end of the world but that change was not communicated far as I can tell.

Any chancer you can show a pic of one of the 16" guns? mostly interested in knowing what handguards I'm getting, as I've been told my converted 16" gun will have a CZ/European handguard ala the restricted 16" guns sold in canada.

292599368_3182503245356264_5511974680819013825_n.png
 
C-71 is dumb said:
CZ USA boxes

So are we getting American brens now? Not that it's the end of the world but that change was not communicated far as I can tell.

Any chancer you can show a pic of one of the 16" guns? mostly interested in knowing what handguards I'm getting, as I've been told my converted 16" gun will have a CZ/European handguard ala the restricted 16" guns sold in canada.

292599368_3182503245356264_5511974680819013825_n.png
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I'd like to know this as well. Pretty big deal in my books.
 
cptseawolf said:
HB industries does make a longer handguard with a cutout to access gas system
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Thanks.

I had a quick look, from what I can see the longest you can get that is cutout for the short gas system is 13.8", for the long gas system you can get 15.8"

The site isn't super clear but from the quick look I had it looks like these are the options.
 
My 11" 5.56 (that my LGS brought in from north Sylva) had the euro m-lok slots, a CZUB ugg boot stock, and most note worthy a longer 5/30 CZUB branded opaque mag. Not the 5 rounders frequently advertised. These images and posts always come with the disclaimer that the gun may differ from photos.

My box said CZ-USA but the barrel and breech block all say CZUB. I am curious what the IRG imports say.
 
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Sniffer said:
Come to think of it, why aren't adjustable gas blocks more popular on piston guns?

The Bren has basic adjustability but its just that - basic. I think I read that TNA was doing something about the WK180 but I cant bring myself to go down that rabbit hole.
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Because the average civilian owner won't adjust them properly. The reviews of the kel tech rfb is a great example of this.

Mine operated flawless when adjusted correctly for the ammo type, while others reported many issues that could all be traced back to swapping ammo while not adjusting properly
 
Just to add to the confusion, my 14" Bren 2 MS imported from the USA by IRG has Upper Receiver markings that say "Made in Czech Republic" on the Left side, and "CZ-USA, Kansas City, KS" on the Right side. The Lower Receiver says "Made in CZ" on the Left Side, moulded right into the Polymer with raised letters. FWIW...


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