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The drop table can be generated empirically using data taken by the shooter at a rifle range; calculated using a ballistic simulator; or is provided by the rifle/cartridge manufacturer. The drop values are measured or calculated assuming the rifle has been zeroed at a specific range. The bullet will have a drop value of zero at the zero range.
Because when using a telescopic sight, the crosshair lines geometrically resemble the X- and Y-axis of the Cartesian coordinate system where the reticle center is analogous to the origin point (i.e. coordinate [0,0]), the designated sighting-in point is known as a zero, and the act of sighting-in is therefore also called zeroing.
With tangent sights, the rear sight is often used to adjust the elevation, and the front the windage. The M16A2 later M16 series rifles have a dial adjustable range calibrated rear sight, and use an elevation adjustable front sight to "zero" the rifle at a given range. The rear sight is used for windage adjustment and to change the zero range.
Boresighting is a method of visually pre-aligning a firearm barrel's bore axis with the target, in order to more easily zero the gunsight (optical or iron sights). The process is usually performed on a rifle, and can be accomplished either with the naked eye, or with a specialized device called a boresighter. [1]
"Zero-stop" features prevent inadvertently dialing the adjustment knob "below" the primary zero (usually 100 meters/yards for long-range sights), or at least prevent dialing more than a couple adjustment clicks below zero. This feature is also useful on long-range sights because it allows the shooter to physically verify the elevation knob is ...
Cmdr. Cameron Yaste was ridiculed when he was photographed firing his rifle with a backward scope. Yaste was relieved of duty on Friday, just four months after the photo was published.
The reticle is illuminated by a battery-powered LED with varying intensity settings. The mount fits directly to any MIL-STD-1913 Picatinny rail or receiver. Zero is retained despite repeated removal and re-attachment to the weapon. The M145 is extremely resistant to shock and water immersion and has an anti-reflection device and rubber lens caps.
A forced reset trigger (or "hard reset" trigger) is a device that allows a person to fire a semi-automatic firearm at an increased rate. The forced reset trigger works by mechanically resetting the trigger's position after a shot is fired. This allows for an increased rate of fire.