Co-witness on a pistol works differently than on an AR-15, and most of the bad advice online comes from people applying AR-15 sight geometry to a Glock. On a pistol the optic is only a few millimeters above the slide, the irons are short, and there's no riser to push the optic up to a "lower 1/3" position the way an AR-15 carry-handle setup does. This guide covers absolute vs l …
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