Peep sight
Appearance
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In firearms, a peep sight (also known more formally as an "aperture sight") is a type of rear gunsight, having an adjustable eyepiece with a small aperture through which the front sight and the target are aligned. These sight are used on target rifles of several disciplines and on several military rifles such as the M-1 Garand, the No 4 series Enfields and the M-16 series of weapons along with several others. Peep sights are very effective in poor lighting, and have found favor with a few hunters who hunt in heavy cover.