I have never paid much attention to this before but I wondered about this. On the rear base of the carbine's adjustable sight there is a single index mark that lines up with any of several lines on the adjustable part of the sight and is held in place by a tiny screw. I was going to set my mechanical zero by moving sight all the way to left, then count clicks all the way to the far right and divide that number in half to move the required number of clicks back to the center. Now, when that is done the index lines from the base and movable portion are not lined in the center...the line on the movable portion are a bit to one side of the base index line. Should I loosen the screw in order to adjust the small movable index marks to align with the base's center index line and will that then be proper mechanical center? Hope my question isn't too confusing.Information
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