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  2. Foldscope - Wikipedia

    en.wikipedia.org/wiki/Foldscope

    A Foldscope is an optical microscope that can be assembled from simple components, including a sheet of paper and a lens. It was created by Manu Prakash and designed to cost less than one USD to build. It is a part of the "frugal science" movement which aims to make cheap and easy tools available for scientific use in the developing world. [2]

  3. Extractor (firearms) - Wikipedia

    en.wikipedia.org/wiki/Extractor_(firearms)

    A flip-up barrel and lack of extractor on a Beretta Bobcat semi-automatic pistol. Some very early blowback pistols used ammunition with no rim or extractor groove on the cartridge cases (e.g., 5mm Bergmann), and such pistols, therefore, lacked extractors. The spent case was forced out of the chamber by recoil and was subsequently ejected.

  4. Caliber conversion device - Wikipedia

    en.wikipedia.org/wiki/Caliber_conversion_device

    Sleeves that exceed the chamber length are generally used in break open actions, which allow easy insertion and removal. Like supplemental chambers, caliber conversion sleeves completely surround the new cartridge case, but cannot be ejected or fed from a magazine, so they only offer a single shot per barrel without manual extraction and reloading.

  5. Improvised firearm - Wikipedia

    en.wikipedia.org/wiki/Improvised_firearm

    Improvised versions are made by using two pipes and an end-cap; they usually fire shotgun shells. To fire the gun, the user inserts a shotgun shell into the smaller diameter pipe, places the smaller pipe into the larger diameter pipe, and forcefully slides it back until the shell's primer makes contact with a fixed firing pin located inside the ...

  6. Precision-guided firearm - Wikipedia

    en.wikipedia.org/wiki/Precision-guided_firearm

    The three main technologies employed for long-range shooting—the bolt-action rifle, telescopic rifle scope and machined cartridge ammunition—were developed in the nineteenth century. The first bolt-action rifle was produced in 1824 by the German firearms inventor Johann Nicolaus von Dreyse. The first documented telescopic rifle sight was ...

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  8. Break action - Wikipedia

    en.wikipedia.org/wiki/Break_action

    Close-up of an IOF 32 break-action revolver. The first break-action revolver was patented in France and Britain at the end of December in 1858 by Devisme. [1] A substantial hinge pin joins the two parts of the rifle or shotgun; the stock with its firing mechanism and the fore-piece and barrel, which hold the round to be fired.

  9. Thompson/Center Contender - Wikipedia

    en.wikipedia.org/wiki/Thompson/Center_Contender

    A barrel of another caliber or length can be installed and pinned in place, the fore-end replaced, and the pistol is ready to shoot with a different barrel and pre-aligned sights. This allowed easy changes of calibers, sights, and barrel lengths, with only a flat screwdriver being required for this change. [2]

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