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If you are not having ejection issues, dont worry bout it.
Unless you want to worry about it. You certainly can use one if you want.
I dont use the the o ring and never have had a need to.
Last edited by mc223; 03-18-2011 at 19:38.
My BCM came with one in a bag, I havent put it on because extracting is one thing I dont have a problem with!
The donut increases extractor pressure, and helps prevent spring kinking that will lead to breakage (took out a spring that had been snapped in half just the other day).
Its not necessary, but it does improve function MOST of the time. Combined with an extra power extractor spring, it can prevent full bolt closure because the extractor wont snap over.
However, the most common problem with ARs far and wide is failure to extract, so i put them in as a fail safe in all of my ARs.
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