Custom XCR Barrels

aznshooter said:
That shorty XCR is sure sweet looking. For a close quarters carbine I think a 12" would be sufficient in terms of accuracy no?

As far as the restricted classification goes, can you not use the restricted barrel at a range then replace it with the longer barrel to maintain the non-restricted status? Some of the legal gurus sound off here please..
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From talking with the RCMP/CFC lab guys in Ottawa is that being as the lower has the serial number it would be re-registered as a restricted firearm once a short barrel is installed. Getting it back into non-restricted class would require a verifiers report.
So in theory it could be done, but the practicality would make it a PITA.
The problem is that the law makers had little firearms knowledge when the various acts were made and it seems they are reluctant to revisit and correct the flaws in the system.
 
Camp Cook said:
Suputin can ATR look into rechambering my XCR-L 223 barrel to a wildcat 224X6.8spc (necking down a 6.8spc to .224") I'm thinking that 55gr -> 60gr bullets would be awesome in this combo for coyote hunting...

Just saw that it maybe called 5.56x42...

Another cartridge I would be interested in and this would need a new barrel would be a wildcat designed by John at White Oak Armament called a 6MM WOA its slightly different than just necking down a 6.8 case from what I understand the 6 WOA was designed as a competition cartridge and has found some favor as such I am hearing that it maybe the best 6MM to be had in the AR 15 platform.
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It would be expensive as a reamer and possibly a go gage would need to be ordered. The likelyhood of this being used again would be remote so you would have to cover these costs.
Having absolutely zero knowledge of these 2 calibers would make doing them a concern until I could spend some time to learn more about them. Given the amount of work I already have on my plate it will take some time before I can say yay or nay on that 1.
 
Suputin can ATR look into rechambering my XCR-L 223 barrel to a wildcat 224X6.8spc (necking down a 6.8spc to .224") I'm thinking that 55gr -> 60gr bullets would be awesome in this combo for coyote hunting...

Just saw that it maybe called 5.56x42...

Another cartridge I would be interested in and this would need a new barrel would be a wildcat designed by John at White Oak Armament called a 6MM WOA its slightly different than just necking down a 6.8 case from what I understand the 6 WOA was designed as a competition cartridge and has found some favor as such I am hearing that it maybe the best 6MM to be had in the AR 15 platform.
Click to expand...

The biggest issue would be getting a bolt to match the 6.8 SPC rim diameter. We are limited to what RA provides with their rifles. We'd have to start with a 6.8 SPC bolt.

Otherwise, as Rick said, it is simply a matter of a reamer.
 
I'm an engineer and I can't help wondering about certain questions regarding these barrels.
Please do not take any offense at these questions.

Based on how the stock barrel is disassembled, it seams that the thickness can't be increased. It might be able to be increased up to the gas block. However, since gas block slides down the barrel from the muzzle end, that limits the thickness of the barrel.

I understand your using a stainless steal alloy but all steel has a modulus of elasticity of around 200GPA. The modulus of elasticity of steel alloys does change form alloy to alloy, but too my knowledge not signifigantly (in this case I do hope I'm wrong on this).

So how are your match grade barrels going to perform better than the stock barrel if you can't really make a thick (except at the base to gas block), heavier, stiffer barrel?
 
Gobc said:
I'm an engineer and I can't help wondering about certain questions regarding these barrels.
Please do not take any offense at these questions.

Based on how the stock barrel is disassembled, it seams that the thickness can't be increased. It might be able to be increased up to the gas block. However, since gas block slides down the barrel from the muzzle end, that limits the thickness of the barrel.

I understand your using a stainless steal alloy but all steel has a modulus of elasticity of around 200GPA. The modulus of elasticity of steel alloys does change form alloy to alloy, but too my knowledge not signifigantly (in this case I do hope I'm wrong on this).

So how are your match grade barrels going to perform better than the stock barrel if you can't really make a thick (except at the base to gas block), heavier, stiffer barrel?
Click to expand...

No offense taken.
Every manufacturer of almost every commodity tries to keep the costs down, so will source the least expensive options in parts that will work.
This is totally understandable. The difference between the least expensive, barrel from a barrel manufacture who bids on a contract to supply knowing lowest price wins is not any guarantee of getting the best barrels available.
We opted to use barrels made by well known and respected barrel makers whose product is FAR better quality than what any of the factory produced rifles will come with.

Thicker barrel does not equate to more accurate. Thicker barrel will be stiffer which does enhance accuracy from shot to shot as heat is longer in building up to the point that it effects the accuracy or rather POI versus POA distortion from heat.

You are correct that the gas block dictates how thick or thin the barrel profile is as the gas block DOES need to be put on from the muzzle end.
Many precision rigs in 224 caliber have a .750" dia muzzle diameter and they shoot real well.
 
Barrel thickness is just one factor - concentricty of the bore, uniformity of the rifling...many many factors are at play too.
 
alberta tactical rifle said:
From talking with the RCMP/CFC lab guys in Ottawa is that being as the lower has the serial number it would be re-registered as a restricted firearm once a short barrel is installed. Getting it back into non-restricted class would require a verifiers report.
So in theory it could be done, but the practicality would make it a PITA.
The problem is that the law makers had little firearms knowledge when the various acts were made and it seems they are reluctant to revisit and correct the flaws in the system.
Click to expand...

Well the reluctance is understandable. If the lawmakers had to go back and correct the flaws, the they to ADMIT there were flaws in the first place. Good luck trying to force a politician to admit he made a mistake.

Gobc said:
I'm an engineer and I can't help wondering about certain questions regarding these barrels.
Please do not take any offense at these questions.

Based on how the stock barrel is disassembled, it seams that the thickness can't be increased. It might be able to be increased up to the gas block. However, since gas block slides down the barrel from the muzzle end, that limits the thickness of the barrel.

I understand your using a stainless steal alloy but all steel has a modulus of elasticity of around 200GPA. The modulus of elasticity of steel alloys does change form alloy to alloy, but too my knowledge not signifigantly (in this case I do hope I'm wrong on this).

So how are your match grade barrels going to perform better than the stock barrel if you can't really make a thick (except at the base to gas block), heavier, stiffer barrel?
Click to expand...

Rick and greentips basically covered it. Lilja produced a marketing video that does illustrate the point, although to be fair the XCRs do come with decent quality barrel.
[youtube]hf9zZqn00CA[/youtube]
 
Suputin said:
Come on, somebody out there has to want an XCR barrel in 300 Whisper! I am dying to make one in that caliber. :ar15:

Somebody step up and make my day ..........
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If I knew you guys would have been offering this service, I WOULD have done the XCR route... :(

Wanna buy my AR15 and 5.56/.300 uppers in exchange for an XCR in .300W? :D

Someday... it shall be mine...

-M
 
alberta tactical rifle said:
It would be expensive as a reamer and possibly a go gage would need to be ordered. The likelyhood of this being used again would be remote so you would have to cover these costs.
Having absolutely zero knowledge of these 2 calibers would make doing them a concern until I could spend some time to learn more about them. Given the amount of work I already have on my plate it will take some time before I can say yay or nay on that 1.
Click to expand...

Works for me not in any kind of a rush right now Sockeye salmon season is on right now and hunting season is starting for me in only a few more weeks...
 
Suputin said:
The biggest issue would be getting a bolt to match the 6.8 SPC rim diameter. We are limited to what RA provides with their rifles. We'd have to start with a 6.8 SPC bolt.

Otherwise, as Rick said, it is simply a matter of a reamer.
Click to expand...

I also have a 6.8spc conversion kit so no issues with the bolt... :D
 
Suputin said:
The first custom stainless match grade 6.5 Grendel barrel. :)

XCRBbl.JPG


XCR.JPG


It hasn't been shot yet as there are still a few things to be done but it seemed to feed out of the mag no problem when cycling dummies.

This is a non-restricted 18.5" length. The OD behind the gas block is .980" which is considerably heavier than OEM.
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Did we ever get a range report for this? How does it shoot?
 
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