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The mount height itself, that is the distance from the top of rail to center of scope, varies, but typically lies around 36–38 mm (1.4–1.5 in) (higher and lower mounts are also readily available). In total, this gives a typical scoped AR-style rifle a height over bore of around 67–69 mm (2.6–2.7 in).
The bore angle is set to ensure that a bullet on a parabolic trajectory will intersect the LOS to the target at a specific range. A properly adjusted rifle barrel and sight are said to be "zeroed." Figure 3 illustrates how the LOS, bullet trajectory, and range ( R H {\displaystyle R_{H}} ) are related.
The user then adjusts the iron sights or scope reticle to align the point of aim with the projected laser dot. Another more commonly used type of laser boresighter is attached to the muzzle of the barrel, either inserted straight into the bore ("arbor" type) or held in alignment with the barrel via a magnet, and projects a laser beam onto the ...
The height of a scope sight can be measured in many ways. With regard to ballistic calculations, it is generally only measured from the center of the bore axis to the center of the scope sight . With regard to cheek support, several methods are used: On firearms with a picatinny rail, the height is measured from the top of the picatinny rail on ...
Torso Lethal Shot Placement rectangle of 450 × 225 mm (17.7 × 8.85 in) superimposed over a silhouetted soldier. Small arms are often sighted in so that their sight line and bullet path are within a certain acceptable margin out to the longest possible range, called the maximum point-blank range.
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Targets for large-bore use are 9.5 to 13 mm (3 ⁄ 8 to 1 ⁄ 2 in) thick hardened steel; small bore targets are 5 to 6 mm (3 ⁄ 16 to 1 ⁄ 4 in) steel, and airgun targets are 3 mm (1 ⁄ 8 in) steel, although some aluminum targets are produced. Ranges are measured in meters only.
A C79 Optical Sight. The C79 optical sight (SpecterOS3.4x) is a telescopic sight manufactured by Elcan.A variant, the M145 Machine Gun Optic is in use by the US military. It is 3.4×28, meaning 3.4x magnification, and a 28mm diameter objective lens.
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