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2. Boresight (firearm) - Wikipedia

   en.wikipedia.org/wiki/Boresight_(firearm)

   For AR style rifles the upper receiver can be dropped from the lower receiver and the bolt carrier group (BCG) can be removed exposing a clear line of sight through the barrel. With the upper receiver fixed in place you can then co-witness through the barrel and the sights on the top of the rifle, while doing this you can visually align the ...

3. SUSAT - Wikipedia

   en.wikipedia.org/wiki/SUSAT

   The Sight Unit Small Arms, Trilux, or SUSAT, is a 4× telescopic sight, with tritium-powered illumination utilised at dusk or dawn. The full name of the current model is the SUSAT L9A1 . The sight is not designed as a sniper sight, but is rather intended to be mounted on a variety of rifles and to be used by all infantrymen.

4. Tool pusher - Wikipedia

   en.wikipedia.org/wiki/Tool_pusher

   A tool pusher (sometimes toolpusher, pusher, or The Push) is an occupation within the oil drilling industry.. On a land drilling rig the tool pusher may be rig manager and responsible for all operations, but on drillships and offshore oil rigs, tool pushers are department heads in charge of the drilling department and reporting to the Master or Offshore Installation Manager depending on the ...

5. Sight (device) - Wikipedia

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

   Mark III free gun reflector sight mk 9 variant. Another type of optical sight is the reflector (or "reflex") sight, a generally non-magnifying optical device that allows the user to look through a glass element and see a reflection of an illuminated aiming point or some other image superimposed on the field of view. [7]

6. Diopter sight - Wikipedia

   en.wikipedia.org/wiki/Diopter_sight

   A diopter sight is an aperture sight component used to assist the aiming of ranged weapons, mainly firearms, airguns, and crossbows. Diopters function to precisely align the shooter's eye with the front sight and the target, while also producing beneficial optical effects for accurate aiming.

7. Marble Arms - Wikipedia

   en.wikipedia.org/wiki/Marble_Arms

   Marble Arms & Manufacturing Company of Gladstone, Michigan began in 1892 with the invention and manufacture of the Marble Universal Rifle Sight by Webster L. Marble. [1] Frank H. Van Cleve of Escanaba, Michigan shared patent rights on some of the early patents applied for by Webster L. Marble. [ 2 ]