I only use BCM or "better" uppers and I true all mine but I don't think it makes much if any difference. I built 2 identical SBRs and forgot to true one of them. It turned out that it out shot the rifle with the trued upper. I don't think it can hurt unless you get some compound down inside the upper while polishing and lap off the hard coat inside the upper.
Just sayin.
Last edited by Sparky5019; 01-22-16 at 17:20.
"An opinion solicited does not equal one freely voiced," Al Swearengen, Deadwood 1877.
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