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Firearm
A firearm is a portable gun (a barreled ranged weapon) that inflicts damage on targets by launching one or more projectiles driven by rapidly expanding high-pressure gas produced by exothermic combustion (deflagration) of propellant within an ammunition cartridge. If gas pressurization is not achieved via propellant combustion but through mechanical gas compression, then the gun is technically an air gun, not a firearm. The first primitive firearms originated in 10th-century China when bamboo tubes containing gunpowder and pellet projectiles were mounted on spears into the one-person-portable fire lance,, which was later used as a shock weapon to good effect in the Siege of De'an. In 13th century, the Chinese invented the metal-barrelled hand cannon, widely considered to be the true ancestor of all firearms
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PDF
The Portable Document Format (PDF) (redundantly: PDF format) is a file format developed by Adobe in the 1990s to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems. Based on the PostScript language, each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, vector graphics, raster images and other information needed to display it. PDF was standardized as ISO 32000 in 2008, and no longer requires any royalties for its implementation. Today, PDF files may contain a variety of content besides flat text and graphics including logical structuring elements, interactive elements such as annotations and form-fields, layers, rich media (including video content) and three dimensional objects using U3D or PRC, and various other data formats.

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Lapping
Lapping is a machining process in which two surfaces are rubbed together with an abrasive between them, by hand movement or using a machine. This can take two forms. The first type of lapping (traditionally called grinding), involves rubbing a brittle material such as glass against a surface such as iron or glass itself (also known as the "lap" or grinding tool) with an abrasive such as aluminum oxide, jeweller's rouge, optician's rouge, emery, silicon carbide, diamond, etc., between them. This produces microscopic conchoidal fractures as the abrasive rolls about between the two surfaces and removes material from both. The other form of lapping involves a softer material such as pitch or a ceramic for the lap, which is "charged" with the abrasive. The lap is then used to cut a harder material — the workpiece. The abrasive embeds within the softer material, which holds it and permits it to score across and cut the harder material
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Polishing
Polishing is the process of creating a smooth and shiny surface by rubbing it or using a chemical action, leaving a surface with a significant specular reflection (still limited by the index of refraction of the material according to the Fresnel equations.) In some materials (such as metals, glasses, black or transparent stones), polishing is also able to reduce diffuse reflection to minimal values. When an unpolished surface is magnified thousands of times, it usually looks like mountains and valleys
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Automatic Rifle
An automatic rifle is a type of self-loading rifle that is capable of fully automatic fire. Automatic rifles are distinguished from semi-automatic rifles in their ability to fire more than one shot in succession once the trigger is pulled. Automatic rifles are select-fire weapons which are capable of firing in semi-automatic, burst-fire, and/or fully automatic firing modes
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Semi-automatic Firearm
A semi-automatic firearm, or self-loading firearm, is one that not only fires a bullet each time the trigger is pulled, but also performs all steps necessary to prepare it to discharge again—assuming cartridges remain in the firearm's feed device. Typically, this includes extracting and ejecting the spent cartridge case from the firing chamber, re-cocking the firing mechanism, and loading a new cartridge into the firing chamber
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Selective Fire
Selective fire means the capability of a weapon to be adjusted to fire in semi-automatic, burst mode, and/or fully automatic firing mode. The modes are chosen by means of a selector which varies depending on the weapon's design. Some selective-fire weapons have burst fire mechanisms to limit the maximum number of shots fired automatically in this mode. The most common limits are two or three rounds per trigger pull. Fully automatic fire refers to the ability for a weapon to fire continuously until either the feeding mechanism is emptied or the trigger is released. Semi-automatic refers to the ability to fire one round per trigger pull. The presence of selective-fire modes on firearms permits more efficient use of rounds to be fired for specific needs, versus having a single mode of operation, such as fully automatic, thereby conserving ammunition while maximizing on-target accuracy and effectiveness
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Browning BLR
The Browning BLR is a lever-action rifle manufactured by Browning Arms Company
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Ruger Redhawk
The Ruger Redhawk is a DA/SA, large-frame revolver that was first introduced in 1979 by Sturm, Ruger & Company. Made from high-grade steel, it is available in a stainless steel finish. The Redhawk is reinforced to handle extra stress, making it very popular for use by handloaders as it handles the hottest of Magnum loads with ease. In addition, the cylinder itself is longer than most competitors', allowing ammunition to be loaded to a longer overall length. This allows for either increased powder capacity, heavier (and therefore longer) bullets without compromising the powder load, or a combination of both. Custom ammunition manufacturers even have loads made specifically for Ruger revolvers that cannot fit in shorter chambers or revolvers of weaker construction (such as the Smith & Wesson Model 29)
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Ruger Blackhawk
The Ruger Blackhawk is a 6-shot, single-action revolver manufactured by Ruger
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Bolt (firearms)
A bolt is the part of a repeating, breech-loading firearm that blocks the rear of the chamber while the propellant burns and moves to facilitate loading of cartridges from the magazine. The extractor and firing pin are often integral parts of the bolt

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Firing Pin
A firing pin or striker is part of the firing mechanism used in a firearm or explosive device e.g. an M14 landmine or bomb fuze. Firing pins may take many forms, though the types used in fuzes for single-use devices (such as landmines, artillery shells, cluster munitions and grenades etc.) generally have a sharpened point. In contrast, firing pins used in firearms usually have a small, rounded portion designed to strike the primer of a cartridge, detonating the priming compound, which then ignites the propellant (inside) or fires the detonator and booster. Typically, firing pins or strikers are made from steel, aluminum alloy or titanium. However, for specialist applications such as zero metal mines, non-metallic materials are used e.g
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