O ring fix.

I noticed the Brownells kit suggested by the gunsmith consisted of a blue buffer, four turn spring and an o-ring. My 6.8 upper had no o-ring, a black buffer, and an indeterminate spring. So I put an o-ring on it. Just as stiff as the Armalite extractor now. Which also has the o-ring. Think I will stop by the gunshop tomorrow and get new springs and inserts, even though they most likely are in the spares kit I picked up recently.