Lyman Model 48 receiver peep sight, adjustable for windage and elevation, with various-diameter, interchangeable aperture inserts.
Vernier tang peep sight on a Samuel Allport double rifle. Rigby-type bolt peep sight on a Hartmann & Weiss rifle.
Burgess folding peep sight.
Howe-Whelen Combination Safety & Bolt Peep Sight on a Hoffman rifle
A peep sight by Joe Smithson---it slides into a recess in the rear receiver squarebridge, in place of his rear quick-detachable scope mount.
Peep Sight - A type of gunsight, mounted towards the rear of a rifle through which one simply looks, placing the front sight on the target. Also called an aperture sight. With a small aperture, it can be very accurate. With a larger aperture, it allows faster target aquisition. Typically adjustable for windage and elevation. It is superior to the open rear buckhorn or express sight because it requires the shooter to focus on two planes only (the front sight and the target) instead of three (the open rear sight, the front sight and the target). This attribute is especially beneficial for older people who have trouble focusing at near distances. And, the small aperture, by bending light rays at the edge of its metal-to-air interface, effectively acts as a lens.
A folding peep sight, built into the upper tang of a Merkel double rifle---in the folded-down position.
Tang-mounted peep sight, adjustable for windage and elevation, on a Dan'l Fraser single shot rifle
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