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  2. Red dot sight - Wikipedia

    en.wikipedia.org/wiki/Red_dot_sight

    The mounting standard uses four screws and one cross slot acting as a recoil lug. Used on red dot sights such as Aimpoint Micro, Vortex Crossfire, SIG Sauer ROMEO4 & 5, and some Holosun Paralow variants. [15] C-More standard A mounting standard introduced by C-More Sights. Uses two screws and two notches acting as recoil lugs.

  3. M39 lens mount - Wikipedia

    en.wikipedia.org/wiki/M39_lens_mount

    The M39 lens mount is a screw thread mounting system for attaching lenses to 35 mm cameras, primarily rangefinder (RF) Leicas. It is also the most common mount for Photographic enlarger lenses. True Leica Thread-Mount (LTM) is 39 mm in diameter and has a thread of 26 turns-per-inch or threads-per-inch (tpi) (approximately 0.977 mm pitch) of ...

  4. Sigma SA-mount - Wikipedia

    en.wikipedia.org/wiki/Sigma_SA-mount

    There were two precursors to the introduction of SA-mount cameras, the manual-focus Sigma Mark-I in 1976, which still featured a M42 screw lens mount, and the SA-1 of 1983 with Pentax K-mount. Mechanically, the (inner) SA-mount is similar to the Pentax K-mount as well, [ 2 ] but with a flange focal distance of 44.00 mm, identical to that of the ...

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  6. Zero insertion force - Wikipedia

    en.wikipedia.org/wiki/Zero_insertion_force

    Zero insertion force (ZIF) is a type of IC socket or electrical connector that requires very little (but not literally zero) force for insertion. With a ZIF socket, before the IC is inserted, a lever or slider on the side of the socket is moved, pushing all the sprung contacts apart so that the IC can be inserted with very little force ...

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  8. Bayonet mount - Wikipedia

    en.wikipedia.org/wiki/Bayonet_mount

    A bayonet mount A bayonet mount before and after insertion Early-19th century socket bayonet Socket of a bayonet. A bayonet mount (mainly as a method of mechanical attachment, such as fitting a lens to a camera using a matching lens mount) or bayonet connector (for electrical use) is a fastening mechanism consisting of a cylindrical male side with one or more radial pegs, and a female receptor ...

  9. Ruger Single-Six - Wikipedia

    en.wikipedia.org/wiki/Ruger_Single-Six

    Fixed or adjustable iron sights [5] (the Hunter model has provisions for mounting a scope) [6] The Ruger Single-Six is a single-action rimfire revolver produced by Sturm, Ruger & Co. The Single-Six was first released in June 1953.