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  2. PSO-1 - Wikipedia

    en.wikipedia.org/wiki/PSO-1

    The scope body is sealed and filled with nitrogen, which prevents fogging of optics and was designed to function within a -50 °C to 50 °C temperature range. For zeroing the telescopic sight the reticle can be adjusted by manipulating the elevation and windage turrets in 5 centimetres (2.0 in) at 100 metres (109 yd) (0.5 mil or 1.72 MOA ...

  3. Sighting in - Wikipedia

    en.wikipedia.org/wiki/Sighting_in

    Because when using a telescopic sight, the crosshair lines geometrically resemble the X- and Y-axis of the Cartesian coordinate system where the reticle center is analogous to the origin point (i.e. coordinate [0,0]), the designated sighting-in point is known as a zero, and the act of sighting-in is therefore also called zeroing.

  4. C79 optical sight - Wikipedia

    en.wikipedia.org/wiki/C79_optical_sight

    The current issue model features an improved mounting system for better return to zero. The C79A2 has a green rubber armored cover to help the optic blend in with the Canadian CADPAT uniform. The A2 series is the optics mid life upgrade for the C7A2 program as the tritium needs to be replaced every 8 to 12 years of service."C79A2" is engraved ...

  5. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    When using a scope with both mrad adjustment and a reticle with mrad markings (called a mrad/mrad scope), the shooter can spot his own bullet impact and easily correct the sight if needed. If the shot was a miss, the mrad reticle can simply be used as a "ruler" to count the number of milliradians the shot was off target.

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  7. EOTech - Wikipedia

    en.wikipedia.org/wiki/EOTech

    The sight's parallax due to eye movement is the size of the optical window at close range and diminishes to zero at the set distance. [ 15 ] To compensate for any change in the laser wavelength, the EOTECH sight employs a holography grating that disperses the laser light by an equal amount but in the opposite direction as the hologram forming ...

  8. Block and unblock email addresses in AOL Mail

    help.aol.com/articles/block-and-unblock-email...

    Block email addresses. 1. Open an email or select it from your mailbox. 2. Click the More icon. 2. Click Block Senders. 2. Optionally, select to also delete emails you've received from the sender.

  9. Advanced Combat Optical Gunsight - Wikipedia

    en.wikipedia.org/wiki/Advanced_Combat_Optical...

    The first ACOG model, known as the TA01, was released in 1987. [3] [4] An example was tested on the Stoner 93 in the early 1990s by the Royal Thai Armed Forces. [5]In 1995, United States Special Operations Command selected the 4×32 TA01 as the official scope for the M4 carbine and purchased 12,000 units from Trijicon. [6]