I have a preban Oly that I have been haveing failure to feed problems. I totally rebuilt the bolt and used wolf springs and the xring and one gas ring design from Oly. I tried it out and it still had the same problems after about thirty rounds and after it got hot"barrel smoking" it "the bolt" locked in the chamber and now won't rotate out. I have another complete bolt assy. that has less than 5oo rounds through it could I just try it with out worring about headspace or not? Thanks Autogunner.

I am guessing that it is short stroaking when it fails to feed..

First I would try with standard rings, (cheap trial and error)it sounds like the barrel/bolt is on the underheadspaced side.


You should use gauges when switching bolts, I would probably chance it if the rings swap did not work.

Robert

autogunner,

Who did the assembly of your OAI? Has the HS been checked already? Have you examined the inside of the chamber with a reflector? Is the barrel stainless or chrome-moly?

This is the original barrel commando style with long flash hider I changed the upper to a flat top but it has had this problem sence I bought it last year. If I buy a new bolt why does it need to be head spaced, how can you adjust it out if it is wrong with a new bolt?
Thanks Autogunner P.S. the barrel is crhome I beleive and I have not checked the chamber with a reflecter.Also I rebuilt it and used the xring from oly and it doesnot spring at all it won't even hardly move is this normal or not and do you use the insert that goes inside the spring with it because I did not,their were no instructions sent with it?

Does that mean that originally it was a factory assembled rifle? Look at the rear of the takedown pin lug? Do you see something stamped there? Look inside the lower where the take down pin lug seats ("above" the pistol grip) do you see anything stamped there?



Because changing the bolt may change the HS, or the barrel may have never been HSed. You don't HS the bolt, you HS the barrel.



Depends on if the barrel is chromed and how far out the HS is.



Not likely if it came from OAI. What leads you to believe it's chromed? Look forward of the FSB, at 12 o-clock on the barrel. What does the stamping there say?



What doesn't "spring"? The extractor? If the extractor is too stiff you can have malfs. The extractor has to be able to move aside during chambering.



According to [url=http://www.olyarms.com/exring.html]this[/url] you do not use the extractor spring insert when using the EXring.