AR10 barrel blueprint

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9 years 8 months ago #44674 by nezrongero
AR10 barrel blueprint was created by nezrongero
Part of my retirement present I bought a Bridgeport and lathe with plans to do my own barrels from blanks. It has been a journey to say the least in learning how to properly operate these machines.

My immediate plan is to turn one of my shot out bench rest barrel into a 16 inch AR10 308 upper. I've searched the web looking for barrel dimensions/blueprints to no avail. Do you guys have any prints I could acquire for a fee. I got the barrel extension, bolt, and flash hider and have taken measurements relative to chambering, it would be a bog plus if I were to locate prints for this project.

Thank you.

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9 years 8 months ago #44694 by GGaskill
Replied by GGaskill on topic AR10 barrel blueprint
You're looking for the dimensions for an original AR10 barrel or what? What length gas tube do you have?

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9 years 8 months ago #44698 by nezrongero
Replied by nezrongero on topic AR10 barrel blueprint

GGaskill wrote: You're looking for the dimensions for an original AR10 barrel or what? What length gas tube do you have?


Thank you.

I am looking for any AR10 prints or DPMS. Initially project is for a 16 1/2 inch barrel and next would be a service rifle 20 inch barrel suitable for long range competition.

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9 years 8 months ago #44700 by GGaskill
Replied by GGaskill on topic AR10 barrel blueprint
I cannot help with the 16 1/2" barrel if you are looking to copy some existing model. For match shooting, take a look at my post in the American Spirit Arms thread. That one has a 31" Kreiger barrel and has done well at 600 yards although I have not yet tried it to 1000 yards. I consider a 20" barrel to be marginal for a match rifle for long range, especially if you are using iron sights. I can give you dimensions for that barrel if you like. But I see no reason you couldn't do a 16 1/2 incher by just cutting that one off at that length.

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9 years 8 months ago #44704 by nezrongero
Replied by nezrongero on topic AR10 barrel blueprint

GGaskill wrote: I cannot help with the 16 1/2" barrel if you are looking to copy some existing model. For match shooting, take a look at my post in the American Spirit Arms thread. That one has a 31" Kreiger barrel and has done well at 600 yards although I have not yet tried it to 1000 yards. I consider a 20" barrel to be marginal for a match rifle for long range, especially if you are using iron sights. I can give you dimensions for that barrel if you like. But I see no reason you couldn't do a 16 1/2 incher by just cutting that one off at that length.


Yes, I will take any information you can give. Thank you, appreciate it. Unfortunately, for service rifle competition the barrel limit is 20 inches and iron sights, I've shot the lowly AR15 and 80 Bergers at 1000 yards as well as the M1 Garand and M1a, and the rifles did fine. Now, want to give the AR10 variety a try.

The 16 1/2 is for a pig gun that does double duty as a truck when we venture down the TexMex border.

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9 years 8 months ago - 9 years 8 months ago #44714 by GGaskill
Replied by GGaskill on topic AR10 barrel blueprint
Whose rules show an AR10 as a Service Rifle? I am guessing you plan to fit in the NRA rules as an M-110 series rifle:

"U.S. Rifle, Caliber 7.62 mm M-110 series–– In all courses of fire and in all positions the standard 20-round box magazine or a reduced capacity magazine of the same external dimensions will be attached. The flash suppressor may be removed or the rifle may be manufactured without a flash suppressor. Barrel length may not exceed 20 inches, as measured to the end of the riflling (sic) in the barrel. The front sling must be attached to the end of the handguard, and must remain in the 6 o’clock position no more than 1/2 inche (sic) from its original location. The sights must be of the standard design found on the M-16 series of firearms. Rear sight windage and elevation adjustments may be modified to allow finer adjustments. Plastic covers may be used on the mounting rails on the handguard."

It's not clear what barrel profiles will be allowed. Pix of the M-110 I have seen show different profiles including a suppressed one, so you might be able to claim that a suppressor diameter barrel mimics the suppressed profile. What do you plan to use for a front sight?

I would request a ruling from the NRA regarding what profiles are permitted before putting more money than a stamp into the project. If you have CAD software, I can send you a .dwg or .dxf file with my barrel profile. If not, I can convert the drawing into a .gif and post that.

For the pig gun, do you carry or hunt from a vehicle?
Last edit: 9 years 8 months ago by GGaskill.

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9 years 8 months ago - 9 years 8 months ago #44716 by nezrongero
Replied by nezrongero on topic AR10 barrel blueprint
That is correct, the NRA long range M110 series rifle. The profile under the handguard is whatever can fit just like the AR15, but clear either what the barrel profile would be and what size gas block could be used. I will research that part.

I do not have any cad software, if you can save it in pdf that would be great. I am hoping that you have the detailed dimensions of the tenon area.

We carry weapons wherever we down to the border. The AR10 shorty would be nice to have in the truck.

Thank you.
Last edit: 9 years 8 months ago by nezrongero.

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9 years 8 months ago #44732 by GGaskill
Replied by GGaskill on topic AR10 barrel blueprint
The best drawing in my possession (I am out of town for another six days) does not show the thread pitch for the barrel extension but you should be able to get that from the extensions you intend to use. You need to determine what you are going to use for the front sight/gas block. The AR15 version is really too small for a big rifle and I don't know if you can find original AR-10 front sights. The length and diameter of the block seat will depend on what you use.

Iron sights for the pig gun or scope? If scope, I can include a drawing for a gas block.

www.gunneyg.info/images/AR10Barrel2.gif

OK, the lines for the front end of the barrel are missing but just whack off the .990 dimension lines at the 16.5 marker.

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9 years 8 months ago #44733 by nezrongero
Replied by nezrongero on topic AR10 barrel blueprint
Thank you!!!

That image came through fine, that is very helpful.

The pig gun will have a scope, a 2.5x10x32, a nice little compact that has enough magnification range, threaded 5/8x24 for a Surefire brake/suppressor adapter. Great thing to be in TX, suppressors are legal for hunting game and non game. Will probably have to play with adjustable gas block.

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9 years 8 months ago - 9 years 8 months ago #44737 by GGaskill
Replied by GGaskill on topic AR10 barrel blueprint
Don't take my dimensions as unalterable Gospel; check them against the parts you are actually going to use to be sure of proper fit before cutting. That area for the gas block will need to be customized for the block/front sight you actually use.

Custom gas block for rifles not needing an AR-type front sight .
Last edit: 9 years 8 months ago by GGaskill.

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