Thanks, guys.
Then, if you are off a complete degree, your front sight would only be out of possition by less then .018". I think the sight being off that much would not be an issue. I do think the gas cylinder/op. rod position would be more of a problem. I use a Starret #12 machinest's adjustable bubble level that is graduated in one degree increments. I try to get the barrel "perfectly" indexed, but I'm sure it's never perfect. (I'm looking at a "bubble")
if you are off .018 you will also use 2 minutes of windage to zero the rifle
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