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If you want to see how much out the barrel mating surface is on your AR 10 upper this will show you. I have used it on three different uppers and all were out of square in the same place. My .6.5 CM shoots fantastic all trued up. This is a very great investment for the AR 10 builder.
Verified purchase: Yes | Condition: New
Very easy to use.
Verified purchase: Yes | Condition: New
Trues your upper receiver!
Verified purchase: Yes | Condition: New