Ar-15 mcfarland™ bolt gas ring

My understanding is they solve a problem that does not exist.
The bolt has 3 rings...in case 1 or 2 fail. Your gun runs just fine. Only needs 1 to run.
If the mcfarland fails....your gun is useless.


That is my basic AR knowledge. Someone with some serious AR-Foo might know more... :)
 
rivetc78 said:
My understanding is they solve a problem that does not exist.
The bolt has 3 rings...in case 1 or 2 fail. Your gun runs just fine. Only needs 1 to run.
If the mcfarland fails....your gun is useless.


That is my basic AR knowledge. Someone with some serious AR-Foo might know more... :)
Click to expand...

Rev sounds about what I figgered, its just I spent 2 days putting gas rings on bolt heads, and im not twitchy, due to f*)%$ing around with the 3 little gas rings.
Never, I say never try to put gas rings on a bolt after a xl triple triply timmys!!
 
I bought one. 60 rounds in and the carrier drops down.

That being said, I've put at least 600 on the bolt with it on like that. I have one more I'm going to change out for this weekend.

I'll be going back to plain old gas rings.

It's funny, because a guy at my club who seemed to be an AR God seemed to think they were the best solution, but, I'll just be going back to gas rings.
 
Ar-15 mcfarland™ bolt gas ring

The gap in the gas rings allow for thermal expansion and minor surface fouling and irregularity.

The coils do not. They are just split collar rings. The M16 platform has fired 30 billion rounds. We know they cause stoppages. Real gas rings cost 10 cents.
 
rivetc78 said:
My understanding is they solve a problem that does not exist.
The bolt has 3 rings...in case 1 or 2 fail. Your gun runs just fine. Only needs 1 to run.
If the mcfarland fails....your gun is useless.


That is my basic AR knowledge. Someone with some serious AR-Foo might know more... :)
Click to expand...

In the automotive world, rings are frequently used in sets with the end gap offset between each ring. This is a reliable, predictable means of sealing with acceptable leakage. Even if the installer lined all the end gaps up together, I doubt the leakage would be enough to cause functioning issues with full power ammunition. Rings rarely rotate once they've set to their position.

Ring sets have been in use for at least a century and are pretty hard to improve on for an application in such a harsh environment.
 
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