ScopesGuide.com Glossary

Terms that start with E

An ejector is a fitting in the barrel of a gun, usually in that of a break-open's gun, which ejects the fired shells out of the barrel.
Elevation in a scope refers to the adjustment of the point of impact of any firearm in the vertical (up and down) plane.
Eye Dominance is the natural tendency of one eye to take precedence, or to dominate, over the other eye.