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I am a bit confused here northdude.

I assume you sourced some headspace gauges and both barrels chambered the No go?

Or have I got that wrong?




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Appologies. I should have stated that my suppressor would get trashed. It is well built but not as robust as some designed for the task.

I was properly advised when it was built for me to go to a...

I wouldn't shoot my AR in a 3 gun comp without a muzzle break.

Tried shooting without either a suppressor or brake and the difference is a fair bit and my rifle is front heavy. Suppressor is...

Glad you got to the bottom of it.
Hopefully it will be an easy fix.

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Yeah. I do it a bit quicker with a countersink bit in the drill.

Still a pain as I did a couple thousand 50 at a time. And used a giraud tool to trim and chamfer. They are all loaded up now. So...

Not necessarily. The "No go"gauge will indictate excessive headspace if it chambers.

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Had a thought. Load up a dummy round and try and chamber it by hand just pushing the back of the BCG with your finger. Not under the influence of the buffer spring. See how that goes.

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I use milsurp brass and rate it as good as any other brand.

No run out. Lasts for ages. And the best bit is it was free.

Just took a bit of effort to get the primer pockets to point where they...

I have a 3 gun load that has 22.5grn of 2206h with a 64 grn projectile. Use it with a suppressor. Don't use it much anymore tho.
Never tried anything lower sorry. Someone else might know.


...

It is not a gas issue in my opinion.
A few things aside, a safe load in a bolt gun of similar barrel dimensions will be safe in an AR.

As you know you are only ducting off gas to cycle the...

Are your velocities where you would expect them to be with given load?
Are the velocities over a string within 100fps?


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Starting to sound like a headspace issue to me especially since you mentioned the barrel nut.
Have you got access to a chrony?
How far is the brass being thrown? Does it fall in a cluster after...