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has anyone addes a 6.8 upper to thier AR

This isn't arfcom! I would bet most of the guys here don't know what a 6.8 AR is!

To answer your question, no. Don't really see the need when you can push a 77gr 556 pretty fast now days.

!!!!!????

Hey FAST,see what ya mean,2nd post; whats a 6.8 upper.
5.56/223 zings well enough,but stopping isn't great,i'm mixin some JHP everyother round just for fun. remingtons are a lot more EXPENSIVE but fun is fun isn't it. Johnny