AR15 barrel nut shims?

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AR15 barrel nut shims?

Postby mc762x54R on Sat Mar 31, 2018 9:21 am

Anyone near Woodbury want to donate or sell me like 1 or 2 barrel nut shims?

My barrel nut didn't come with enough of them and now I'm SOL until Monday night at least without them :cry: :cry: :cry:
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Re: AR15 barrel nut shims?

Postby Ghost on Sat Mar 31, 2018 9:57 am

Never used them. I just turn it to the next working position. How much torque you have on it?
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Re: AR15 barrel nut shims?

Postby Rip Van Winkle on Sat Mar 31, 2018 11:23 am

What's a barrel nut shim?
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Re: AR15 barrel nut shims?

Postby hammAR on Sat Mar 31, 2018 11:55 am

If you need a shim at all, it should not be more than 1...................
maybe you need a new barrel nut or square the receiver face - barrel nuts are cheap....

http://www.firearmsnews.com/guns/longguns/squaring-the-ar-receiver-face/
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Re: AR15 barrel nut shims?

Postby mc762x54R on Sat Mar 31, 2018 12:23 pm

Its an Aero BAR style, there's only 4 gas tube holes. The handguard bolts to the nut, so the holes in the nut only line up at 90° increments.
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Re: AR15 barrel nut shims?

Postby mc762x54R on Sat Mar 31, 2018 12:28 pm

This is what the nut looks like
Screenshot_2018-03-31-13-28-02.png
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Re: AR15 barrel nut shims?

Postby hammAR on Sat Mar 31, 2018 1:00 pm

:cheers:
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Re: AR15 barrel nut shims?

Postby Ghost on Sat Mar 31, 2018 2:01 pm

mc762x54R wrote:This is what the nut looks like
Screenshot_2018-03-31-13-28-02.png

That’s a hell of a nut. How much have you torqued it and how far off is it?

I’ve gone up to 85 ft-lbs before on an AR. 30-80 is the spec range, no idea what your instructions say though.
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Re: AR15 barrel nut shims?

Postby mc762x54R on Sat Mar 31, 2018 2:59 pm

The range is 30 to 45 for this one, and its no where close without a buch of shims to back it off. They just didn't supply enough of them.
Without shims its about 45°off. 45 ft lbs wouldn't do it.
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Re: AR15 barrel nut shims?

Postby Ghost on Sat Mar 31, 2018 3:06 pm

mc762x54R wrote:The range is 30 to 45 for this one, and its no where close without a buch of shims to back it off. They just didn't supply enough of them.
Without shims its about 45°off. 45 ft lbs wouldn't do it.

Are you greasing it too? Anti seize? Looks like you only need about .005” shim for 45 degrees off. What do you have for shims?

https://aeroprecisionusa.com/media/docs/bar-barrel-nut-instructions.pdf

Edit: reread the instructions and .005 above should be .008.
Last edited by Ghost on Sat Mar 31, 2018 3:46 pm, edited 1 time in total.
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Re: AR15 barrel nut shims?

Postby mc762x54R on Sat Mar 31, 2018 3:32 pm

0.008"
I'm almost 90° off
Lots of grease
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Re: AR15 barrel nut shims?

Postby Ghost on Sat Mar 31, 2018 3:40 pm

mc762x54R wrote:0.008"
I'm almost 90° off
Lots of grease

Have you marked it so that you know the un-shimmed gas tube hole isn’t over rotating the 12 o’clock position once shimmed?

Actually I see I misread the instructions. If you are off 45 degrees without shims .008 should put you right on, it’s the exact example in the link above.
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Re: AR15 barrel nut shims?

Postby mc762x54R on Sat Mar 31, 2018 3:57 pm

Ghost wrote:
mc762x54R wrote:0.008"
I'm almost 90° off
Lots of grease

Have you marked it so that you know the un-shimmed gas tube hole isn’t over rotating the 12 o’clock position once shimmed?

Actually I see I misread the instructions. If you are off 45 degrees without shims .008 should put you right on, it’s the exact example in the link above.


Yes, I triple checked. Each 0.001" only backs the nut off a few degrees, and I'm almost 90°off. If I was closer without any shims, the 0.008" they give would have been enough.
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Re: AR15 barrel nut shims?

Postby mc762x54R on Sat Mar 31, 2018 4:04 pm

Here's the difference between 0.002 and 0.004" of shims
Attachments
20180331_163804 2 shims.jpg
20180331_163444 4 shims.jpg
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Re: AR15 barrel nut shims?

Postby Ghost on Sat Mar 31, 2018 5:15 pm

Head to Napa, oreillys, AA...and see if they have any pinion shims that are about the same size.
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