Grant,
I just got your McFarland ring at my house. It provides noticeably increased pressure and resistance on the inside of the Bolt Carrier as compared to the one I got earlier from Brownells. I don't have a caliper set, but I think it's fair that people know that YOUR G&R Tactical McFarland rings are squared-away. If this is a shameless plug, so be it...I'm using this on my patrol rifle...and reliability is king to me. Just FYI the the other members.


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