Sight Radius - The distance between the front and rear sights. As a longer lever provides greater mechanical advantage, the greater the distance between the two sights, the more inherently accurate they will be. Using the barrel-mounted leaf sight (2) above together with the front sight (3), the sight radius is relatively short. Use, instead, of the aperture sight mounted to the rear receiver ring (1) with the front sight would provide a longer radius and the potential for greater accuracy in aiming.
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