Wise Guy! :)
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Ya know... gas rings are something I never really got to wrapped around the axle over.... I've always found the OEM rings to work fine and if I think I'm having a problem.... I change them.. I got 12K out of a set of rings with no problems... hell.. the Bolt failed before the rings did.. so I got a new bolt with new rings on it........;)
Considering that an AR will cycle with just one gas ring (Don't believe me? Ever notice your rings all aligned??)... I agree there's nothing wrong with OEM's. We were blessed with the genius design of the AR-15. Most of the after market goodies for it are just that, goodies, and offer little significant value except to the guy supporting a family selling those goodies.
So Harv is saying that his bolt failed prematurely so that is reason enough not to try a McFarland gas ring??,,,,,,,,,,,
That's not how I read Harv's reply. But I'm not sure what he defined "Bolt Failed" as. Cracking, broken lug, worn lugs, etc.?
Crane released the 2006 Small Arms Symposium .pdf file, and one of the areas of discussion was Bolt Failure.
It basically said that a weapon undergoing "Harsh Fire Schedules" would see Bolt Failure between 3,000 and 6,000 rounds. A weapon undergoing a "Milder" fire schedule should see a Bolt Fail between 6,000 and 10,000 rounds. These would all be on carbine length gas systems that are much harder on the weapon than a mid length gas system.
My point...I don't think a Bolt Failure at 12,000 rounds could be classified as "Premature".
There is no way that I can see that a MacFarland ring could cause a Bolt Failure of any kind.