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ATN adjustable steel rings have rotatable inserts which allow for as much as 20 Minutes of Angle, or approximately 20 inches at 100 yards, mounting adjustment without touching the scopes internal windage and elevation mechanisms. This in turn allows the user to maintain the scopes center of optical axis when performing the initial installation of a new ATN rifle scope. This feature is extremely important in eliminating parallax and maintaining a centered reticle with application of these units, while offering greater overall zero range selectivity.
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