The Crane upgrades were designed for guns with carbine gas systems (espeically the 10.5 types).
Since middy guns do not run as fast and hard as SBR's, I do not believe that you need to the 5 coil spring and Crane O-Ring. I still like to use the black extractor inserts though.
Now if your 6.8 is over gased (which is entirely possible) and you are having extraction issues, you might want to look at adding an O-Ring.
C4



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