Non Restricted ACR question

A

Animatronic Fireman

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Obviously the factory NR barrel is the way to go but there seems to be several different conversions offered. The group Arms East had do it initially, Herron and some others - is there a consensus on who seems to have done the best conversion?

Thanks
 
Just buy a complete factory ACR 18.5 barrel assembly and throw it on ;) Its not rocket science.

Bring it to a smith and get the status changed

rdsc.ca/products/bushmaster-acr-18-5-cmv-barrel-assembly-including-gas-system-muzzle-device
 
Animatronic Fireman said:
Obviously the factory NR barrel is the way to go but there seems to be several different conversions offered. The group Arms East had do it initially, Herron and some others - is there a consensus on who seems to have done the best conversion?

Thanks
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Herron IMO. And many shooting friends of mine have converted ones from various other shops and home built that I have first hand experience with
 
Herron does the best conversion - bar none - but he's not the cheapest option by a long shot.

I currently own 3 NR conversions that he did (and used to own two ACR's he converted), and have never had any issues with any of them. He takes his time and does top notch work.
 
canucklehead said:
Herron does the best conversion - bar none - but he's not the cheapest option by a long shot.

I currently own 3 NR conversions that he did (and used to own two ACR's he converted), and have never had any issues with any of them. He takes his time and does top notch work.
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You get what you pay for. I just wish he was local
 
I have to say. We are very proud of our AE ACR barrels and conversions. We don't talk about it much?

The AE ACR barrels are high quality, purpose built ACR barrels, made for us for the Canadian market. We don't do custom, one off barrels. We have two barrels, same govt profile as the original ACR carbine, one 4150 CMV Chrome Lined/Phosphated and one 416R Stainless Steel.

We teamed up with one of the most respected barrel manufacturers in the USA who took on our project on and built our barrels on a much smaller scale than is usually possible (thousands less). We duplicated the lighter govt. profile ACR carbine barrel under the handguards, dropped the vestigial M203 notch, and extended the design out to 18.75". We received excellent barrels with the full suite of lab tests and QC. Friends helping friends. The barrels are correct, and accurate. All work including chrome lining and phosphating was performed by shops with decades of US Defence manufacturing experience. Our conversion is performed by an NRA qualified gunsmith with decades of experience. We also have custom tool-work.

We wanted accurate, carbine weight barrels for an accurate rifle and I believe these deliver. Customers have submitted sub-MOA results, as have the shown on test targets accompanying rifles.

We have sold many dozens of the barrels, conversions and rifles since 2015. For owners of DMR rifles, we have also done swaps for the lighter barrel.

While I'm talking, many AE 18.75" Mid-Length CMV and SS barrels are also now in use in competitive AR15 rifles, and... we have more CMV arriving this week in AR15 configuration.
 
dangertree said:
I have to say. We are very proud of our AE ACR barrels and conversions. We don't talk about it much?

The AE ACR barrels are high quality, purpose built ACR barrels, made for us for the Canadian market. We don't do custom, one off barrels. We have two barrels, same govt profile as the original ACR carbine, one 4150 CMV Chrome Lined/Phosphated and one 416R Stainless Steel.

We teamed up with one of the most respected barrel manufacturers in the USA who took on our project on and built our barrels on a much smaller scale than is usually possible (thousands less). We duplicated the lighter govt. profile ACR carbine barrel under the handguards, dropped the vestigial M203 notch, and extended the design out to 18.75". We received excellent barrels with the full suite of lab tests and QC. Friends helping friends. The barrels are correct, and accurate. All work including chrome lining and phosphating was performed by shops with decades of US Defence manufacturing experience. Our conversion is performed by an NRA qualified gunsmith with decades of experience. We also have custom tool-work.

We wanted accurate, carbine weight barrels for an accurate rifle and I believe these deliver. Customers have submitted sub-MOA results, as have the shown on test targets accompanying rifles.

We have sold many dozens of the barrels, conversions and rifles since 2015. For owners of DMR rifles, we have also done swaps for the lighter barrel.

While I'm talking, many AE 18.75" Mid-Length CMV and SS barrels are also now in use in competitive AR15 rifles, and... we have more CMV arriving this week in AR15 configuration.
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I'm interested in this. I have a DMR, and the front is definately heavy. I'm fine with that, it's not a run-n-gun rifle, and I can handle it fine, but I'd like to be able to run the polymer guard. Can I mod the guard to suit? If not, a lighter barrel would work.

Of note, this isn't a pencil barrel is it? I'd still like some consistency after a long string of shots and pencil profiles just don't provide that.
 
AFisher said:
I'm interested in this. I have a DMR, and the front is definately heavy. I'm fine with that, it's not a run-n-gun rifle, and I can handle it fine, but I'd like to be able to run the polymer guard. Can I mod the guard to suit? If not, a lighter barrel would work.

Of note, this isn't a pencil barrel is it? I'd still like some consistency after a long string of shots and pencil profiles just don't provide that.
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The barrel is the same profile as the 16" BM ACR carbine barrel under the handguards. Taper to ~.625 under the handguard, .750" gas block to muzzle with a couple of small steps. Usually described as M4 Govt Profile. Our design deletes the cut forward of the gas block intended to fit a M203 to a M4 carbine, which BM included for some reason on the 16" ACR, which can't fit a M4 M203 anyway ("Vestigal M203 Notch").

The swap requires the barrel and a .625 piston guide block, which we provide.
 
ARMS EAST said:
The barrel is the same profile as the 16" BM ACR carbine barrel under the handguards. Taper to ~.625 under the handguard, .750" gas block to muzzle with a couple of small steps. Usually described as M4 Govt Profile. Our design deletes the cut forward of the gas block intended to fit a M203 to a M4 carbine, which BM included for some reason on the 16" ACR, which can't fit a M4 M203 anyway ("Vestigal M203 Notch").

The swap requires the barrel and a .625 piston guide block, which we provide.
Click to expand...

Awesome, thanks. Maybe I'll just go new barrel vs modding a guard.
 
Mike112288 said:
Nice! These barrels would be good for the maccabee!
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If Arms East did the research and development they claim to have done their ACR barrel should have a smaller gas port than a standard AR barrel, The ACR piston system is more efficient than an AR's DI system so an AR will not cycle with an ACR barrel without opening up the gas port slightly. I've done 4 conversions, had two barrels custom built for me, and I also run a modified factory 16 inch ACR barrel in one of my AR builds so I have first hand experience with this. If you take a factory 16 inch ACR barrel and put it in an AR the rifle will short stroke.
This might be why many guys running the AE barrels need to run their gas system on the S (suppressed) setting rather than U (un-suppressed) for it to cycle correctly as the rifle is overgassed with an AR barrel and the S setting bleeds off more gas.


My apologies to Arms East, I got mixed up between their barrels and one of the other Canadian manufacturers. It was the other ones that are overgassed not the AE barrels. Very sorry about that.

Brian46 said:
It is a heavy barrel (DMR) and the basic (polymer) handguard will not fit over it. If that matters to you
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I haven't tried it but I read that you just need to remove a little of the heat shield for the polymer one to fit. Second hand info so don't take it as gospel.
 
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cr5 said:
If Arms East did the research and development they claim to have done their ACR barrel should have a smaller gas port than a standard AR barrel, The ACR piston system is more efficient than an AR's DI system so an AR will not cycle with an ACR barrel without opening up the gas port slightly. I've done 4 conversions, had two barrels custom built for me, and I also run a modified factory 16 inch ACR barrel in one of my AR builds so I have first hand experience with this. If you take a factory 16 inch ACR barrel and put it in an AR the rifle will short stroke.
This might be why many guys running the AE barrels need to run their gas system on the S (suppressed) setting rather than U (un-suppressed) for it to cycle correctly as the rifle is overgassed with an AR barrel and the S setting bleeds off more gas.




I haven't tried it but I read that you just need to remove a little of the heat shield for the polymer one to fit. Second hand info so don't take it as gospel.
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I tried it, it is actually the handle on the barrel nut that is the issue as the heavy barrel holds it out further. It was not even close to fitting
 
cr5 said:
If Arms East did the research and development they claim to have done their ACR barrel should have a smaller gas port than a standard AR barrel, The ACR piston system is more efficient than an AR's DI system so an AR will not cycle with an ACR barrel without opening up the gas port slightly. I've done 4 conversions, had two barrels custom built for me, and I also run a modified factory 16 inch ACR barrel in one of my AR builds so I have first hand experience with this. If you take a factory 16 inch ACR barrel and put it in an AR the rifle will short stroke.
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But apparently have never seen or examined our barrel.

This might be why many guys running the AE barrels need to run their gas system on the S (suppressed) setting rather than U (un-suppressed) for it to cycle correctly as the rifle is overgassed with an AR barrel and the S setting bleeds off more gas.
Click to expand...

I completely don't believe this.

In another thread you posted this....

Originally Posted by cr5
It should, the gas port on those is too big for an ACR which means they probably did no R&D and just ordered some 18.75 inch AR barrels and passed them off as ACR barrels for double the price.
It will be mid length gas system if it's from an ACR so keep that in mind when ordering your gas tube.
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And I posted.... in reply.

Wow.

You are 100% wrong.

Our ACR barrels are purpose built ACR barrels, made to our profile and spec in the USA with correctly sized gas ports and full factory QC. NOT shortened AR15 barrels, etc. NOT no R&D.

I am surprised you would make such an assumption then post it as fact.
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Now you are going deeper with claims I have heard from no one but you. Overgassed? Many guys? Who?? We have never heard of this outside of your post. Never heard this from a customer, never experienced this in the dozens of rifles we have built and test fired. Our barrels work EXACTLY like the OEM barrels.

TO BE CLEAR ONCE AGAIN. OUR ACR BARRELS HAVE CORRECTLY SIZED GAS PORTS FOR THE ACR. THEY WORK AS DESIGNED. THEY ARE NOT AR15 BARRELS. THEY DO NOT HAVE AR15 GAS PORTS

At this point I wondering if you are confusing our barrels for another company in Canada who does indeed use modded AR15 barrels, and is quite open about this???
 
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ARMS EAST said:
At this point I wondering if you are confusing our barrels for another company in Canada who does indeed use modded AR15 barrels, and is quite open about this???
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Yup all the barrels that have issues are made by DLASK not Arms East

I should know I had a Dlask on one of my ACRs, and needed to run it in S mode.
 
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