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  2. Lewis Machine & Tool Company - Wikipedia

    en.wikipedia.org/wiki/Lewis_Machine_&_Tool_Company

    A patented AR-15-pattern is produced with a bolt design featuring a redesigned extractor intended to improve the extraction of cartridges under adverse conditions. The company also produces a redesigned bolt carrier intended to improve the reliable performance of the rifle's “internal piston” system by obtaining a similar timing sequence with 14.5-inch carbine-length barrels compared to 20 ...

  3. Front Sight Firearms Training Institute - Wikipedia

    en.wikipedia.org/wiki/Front_Sight_Firearms...

    Front Sight Firearms Training Institute, also known as Front Sight and as Front Sight Resorts, was founded in 1996 by Dr Ignatius Piazza.. Piazza, a California native and former chiropractor, and himself one of the few graduates of the Four Weapons Combat Master program developed by notable firearms instructor and writer Chuck Taylor, spent 25 years developing hundreds of acres of desert into ...

  4. RPD machine gun - Wikipedia

    en.wikipedia.org/wiki/RPD_machine_gun

    The front sight is adjusted up or down for elevation using a tool included in the issued cleaning kit. To adjust the front sight for windage, the smaller of the two wrenches on the multi-tool included in the issued cleaning kit is used to loosen the retaining bolt on the front sight clamp. The front sight can then be adjusted left or right for ...

  5. Iron sights - Wikipedia

    en.wikipedia.org/wiki/Iron_sights

    The most common is a rear sight that adjusts in both directions, though military rifles often have a tangent sight in the rear, which a slider on the rear sight has pre-calibrated elevation adjustments for different ranges. With tangent sights, the rear sight is often used to adjust the elevation, and the front the windage.

  6. 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 ...

  7. Globe sight - Wikipedia

    en.wikipedia.org/wiki/Globe_sight

    A globe sight is a front sight component used to assist the aiming of a gun/device, usually those intended to launch projectiles, such as firearms, airguns, and crossbows. It is found in particular as a front sight element on rifles. To obtain a usable sighting line, the diopter has to have a complementing rear sight element. Diopter and globe ...

  8. AK-74 - Wikipedia

    en.wikipedia.org/wiki/AK-74

    The front sight is a post adjustable for elevation in the field. Horizontal adjustment requires a special drift tool and is done by the armoury before issue or if the need arises by an armourer after issue. The sight line elements are approximately 48.5 mm (1.9 in) over the bore axis.

  9. M249 light machine gun - Wikipedia

    en.wikipedia.org/wiki/M249_light_machine_gun

    Soldiers complained that the front sight required special tools to be adjusted. On August 23, 1985, then- U.S. Under Secretary of the Army James R. Ambrose suspended M249 production pending the development of a product improvement program (PIP.) [ 35 ] Congress removed funds for the M249 from the Fiscal Year 1986 defense budget, then ...