AR15 barrel nut shims?

[mc762x54R]

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

[Ghost]

Never used them. I just turn it to the next working position. How much torque you have on it?

[Rip Van Winkle]

What's a barrel nut shim?

[hammAR]

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/

[mc762x54R]

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.

[mc762x54R]

This is what the nut looks like

[hammAR]

[Ghost]

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.

[mc762x54R]

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.

[Ghost]

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.

[mc762x54R]

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

[Ghost]

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.

[mc762x54R]

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.

[mc762x54R]

Here's the difference between 0.002 and 0.004" of shims

[Ghost]

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