Failure to feed....Why?.

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Ensure you don’t have grease or heavy oil coat on the buffer spring or tube. Clean it out and use a light coat of clp or some such to prevent rust only, it should not be “wet”.
 
The O ring was added by Crane because the M16 extractor spring was inadequate for the M4 in both full auto and semi auto.
 
Update to my issue. Sorry its been a while but moving and health issues have put me behind on some project’s.
I ended up replacing the extractor spring and decided I would measure the gas port hole on the barrel. It appeared to be undersized. I drilled it out to 5/64 and put it all back together. Took it out tonight and ran 30 rounds through it. No issues.
Majority of the rounds landed 2-3 ft slightly to the side and to my rear (. 5 o’clock).
So so far so good. The barrel did drill fairly easy and only a thin metal ribbon came out.
Thanks to all who offered help and sorry it to so long to finish up.
 
If you had to ream out the gas port hole, that was underfunction then. Insufficient gas (and energy) to work the action.
 
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