ejector
An ejector automatically throws spent shells clear of the firearm's action, so that the shooter does not have to do it themselves. Ejectors are usually combined with extractors, but this is not always the case, especially in break-action firearms. A break-action firearm that has extractors but does not have ejectors will need to have the spent shells removed by hand before fresh shells can be loaded.
exit pupil
The exit pupil of a telescopic sight is viewed through the eyepiece, the lens closest to the shooter. The exit pupil is not the lens itself, rather, the exit pupil is the disc of light that is funneled by the objective lens to the eyepiece. The size of the exit pupil is equal to the diameter of the objective lens divided by the magnification, so a 6x30 scope (6x magnification with a 30mm objective lens) will have a 5mm exit pupil.
The pupil of an adult human is about 5-7mm, so a 7mm exit pupil will provide the brightest, clearest image possible. Exit pupils larger that 7mm will not provide increased clarity, but they will allow more flexibility in terms of the shooter's eye placement and allow the scope to gather more light, increasing visibility in low-light situations. Exit pupils smaller than 7mm will require precise placement of the shooter's eye and will not provide as bright of an image.
The pupil of an adult human is about 5-7mm, so a 7mm exit pupil will provide the brightest, clearest image possible. Exit pupils larger that 7mm will not provide increased clarity, but they will allow more flexibility in terms of the shooter's eye placement and allow the scope to gather more light, increasing visibility in low-light situations. Exit pupils smaller than 7mm will require precise placement of the shooter's eye and will not provide as bright of an image.
extractor
An extractor pulls the cartridge from its firing position in the chamber when the action is cycled. Extractors partially or completely remove the cartridge from the chamber, where it can then be removed from the firearm entirely by an ejector or by hand, depending on the firearm's design.
eyepiece
The eyepiece of a telescopic or dot sight is the lens closest to the shooter, which the shooter looks through to use the sight.
eye relief
Eye relief is the maximum distance allowable between the shooter's eye and the eyepiece of a sight. Exceeding the eye relief of a particular scope will result in a partially obscured or completely invisible sight picture (vignetting).
Extremely high-magnification scopes will sometimes have a very short eye relief, around 2 inches, while some styles of dot sight have unlimited eye relief. Most sights, however, fall somewhere around 3-5 inches.
In order to mount a sight on a pistol or scout rifle, a special LER (long eye relief) sight must be used.
Extremely high-magnification scopes will sometimes have a very short eye relief, around 2 inches, while some styles of dot sight have unlimited eye relief. Most sights, however, fall somewhere around 3-5 inches.
In order to mount a sight on a pistol or scout rifle, a special LER (long eye relief) sight must be used.
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