You don't need the O-ring. People need to look at why this issue came about, those who were shooting and what they are shooting. Not one of my AR's needs an O-ring to extract and function properly.
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Colt 6920, about 1,000 rounds through it, on a recent cleaning noticed no O ring, just the "gold" spring with black insert. Do I need the O ring? Seems to run fine, no extraction issues. I've read through this thread and am confused as to whether or not I need this ring or not. What extraction problems could arise with or without O ring? Did it ship without the O ring, or did I loose it?
Thanks