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2. Iron sights - Wikipedia

   en.wikipedia.org/wiki/Iron_sights

   The viewing aperture above the "3" (denoting the 300 m setting) can be seen Pictures taken under identical conditions through large (left) and small (right) diameter aperture sights, with camera focused on front sight. Aperture sights, also known as "peep sights", range from the "ghost ring" sight, whose thin ring blurs to near invisibility ...

3. Sighting in - Wikipedia

   en.wikipedia.org/wiki/Sighting_in

   These circle targets are especially suitable for peep sights, aperture sights, dot reticles, and bead front sights; and are most useful when the apparent diameter of that sight feature matches the apparent diameter of the contrasting circle at the selected distance to target. Firearms with blade front sights and notch rear sights may reduce ...

4. Sheridan Products - Wikipedia

   en.wikipedia.org/wiki/Sheridan_Products

   With a large cast and machined aluminum receiver, bronzed barrel and pump tube, walnut stock with Monte Carlo cheek-piece, ball-type valve mechanism, adjustable trigger, and peep sight. It weighed 5 pounds 14 ounces, stretched 37 inches overall, with a 20-inch barrel with one turn in 12 inches.

5. Diopter sight - Wikipedia

   en.wikipedia.org/wiki/Diopter_sight

   Civilian AR-15 target sights have an aperture between 1 and 1.15 mm (0.039 and 0.045 in). The aperture on AR-15 military sights have a day aperture of approximately 1.78 mm (0.070 in), and the M16A2 also a night setting with a larger 5.08 mm (0.200 in), and as such the military sight is not strictly a diopter sight in either setting.

6. Sight (device) - Wikipedia

   en.wikipedia.org/wiki/Sight_(device)

   On weapons, these sights are usually formed by rugged metal parts, giving them the name "iron sights", [4] as distinct from optical or computing sights. [5] On many types of weapons they are built-in and may be fixed, adjustable, or marked for elevation , windage , target speed, etc. [ 3 ] They are also classified in forms of notch (open sight ...

7. Winchester Model 69 - Wikipedia

   en.wikipedia.org/wiki/Winchester_model_69

   The Target model was advertised with a Winchester #80A aperture sight and a post front sight, while the Match model had a Lyman #57E peep sight, a hooded front sight, and a 1 in (25 mm) wide leather sling; the sling width was changed to 1 1 ⁄ 4 in (32 mm) in 1947. The generally unpopular factory telescopic sight options were dropped in 1941. [5]