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Has the barrel for the 6.8 upper always been Spec II or did it used to be SAAMI? Has the barrel always been 1:11 or did it used to be a different twist?

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Our 6.8 barrels used to have SAAMI chambers and 1/10 twist. They now all have Spec II with a 1/11 twist.

If you see 1/11 on the barrel it has a Spec II chamber.

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