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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.[1][2][3] 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.[4] 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,[5], 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. The technology gradually spread through the rest of East Asia, South Asia, the Middle East, and Europe
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Hand-eye Coordination
Eye-hand coordination (also known as hand–eye coordination) is the coordinated control of eye movement with hand movement, and the processing of visual input to guide reaching and grasping along with the use of proprioception of the hands to guide the eyes. Eye–hand coordination has been studied in activities as diverse as the movement of solid objects such as wooden blocks, archery, sporting performance, music reading, computer gaming, copy-typing, and even tea-making. It is part of the mechanisms of performing everyday tasks; in its absence most people would be unable to carry out even the simplest of actions such as picking up a book from a table or playing a video game
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Anti-materiel Rifle
An anti-materiel rifle (AMR) is a rifle that is designed for use against military equipment (materiel), rather than against other combatants ("anti-personnel"). Contents1 History1.1 World War I 1.2 World War II 1.3 Cold War 1.4 Desert Storm 1.5 Modern day2 Description 3 List of anti-materiel rifles 4 See also 5 References 6 External linksHistory[edit] The origins of the anti-materiel rifle go back to the First World War, during which the first anti-tank rifles appeared. While modern tanks and most other armored vehicles are too well protected to be affected by anti-materiel rifles, the guns are still effective for attacking unarmored or lightly armored vehicles. They can also be used against stationary enemy aircraft, missile launchers, radar equipment, small watercraft, communications equipment, crew served weapons and similar targets
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.22 LR
The .22 Long Rifle
Rifle
(metric designation: 5.6×15mmR) cartridge is a long-established variety of .22 caliber rimfire ammunition, and in terms of units sold is still by far the most common ammunition in the world today. The cartridge is often referred to simply as .22 LR ("twenty-two-/ɛl/-/ɑːr/") and various rifles, pistols, revolvers, submachine guns and even some smoothbore shotguns (No. 1 bore) have been manufactured in this caliber.Contents1 History 2 Popularity in the US 3 Performance 4 Variants4.1 Subsonic 4.2 Standard velocity 4.3 High velocity 4.4 Hyper-velocity 4.5 Shot cartridges 4.6 Full metal jacket 4.7 Tracer5 Cartridge construction 6 Cartridge length 7 Usage 8 Cartridge dimensions 9 Muzzle velocity
Muzzle velocity
(nominal) 10 See also 11 References 12 External linksHistory[edit] American firearms manufacturer J
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Double-action
Double action or Double-action refers to one of two systems in firearms where the trigger both cocks and releases the hammer Double-action only
Double-action only
(DAO) firearms trigger: The trigger both cocks and releases the striker. There is no single-action function and the striker will return to its decocked position after each shot. Traditional double-action– or double-action/single-action (DA/SA)– firearms trigger: The trigger combines the features of both a double-action only and a single-action only trigger. The firing mechanism automatically cocks the striker after the gun is fired. This mechanism will cock and release the striker when the striker is in the down position, but on each subsequent shot, the trigger will function as a single-action when using a semi-automatic. With a revolver you can cock the hammer first and then shoot (single action), or you can pull the trigger and it will cock and release the hammer (double action)
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Middle East
The Middle East
Middle East
is a transcontinental region centered on Western Asia, Turkey
Turkey
(both Asian and European), and Egypt
Egypt
(which is mostly in North Africa). Saudi Arabia
Saudi Arabia
is geographically the largest Middle Eastern nation while Bahrain
Bahrain
is the smallest. The corresponding adjective is Middle Eastern and the derived noun is Middle Easterner
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Projectile
A projectile is any object thrown into space (empty or not) by the exertion of a force.[1] Although any object in motion through space (for example a thrown baseball) may be called a projectile, the term more commonly refers to a ranged weapon.[2][3] Mathematical equations of motion are used to analyze projectile trajectory.Contents1 Motive force 2 Delivery projectiles 3 Sport projectiles 4 Kinetic projectiles 5 Wired projectiles 6 Typical projectile speeds 7 See also 8 References 9 External linksMotive force[edit] See also: Projectile
Projectile
motion Projectile
Projectile
and cartridge case for the massive World War II
World War II
Schwerer Gustav artillery piece. Most projectile weapons use the compression or expansion of gases as their motive force.Blowguns and pneumatic rifles use compressed gases, while most other guns and cannons utilize expanding gases liberated by sudden chemical reactions
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Deflagration
Deflagration
Deflagration
(Lat: de + flagrare, "to burn down") is subsonic combustion propagating through heat transfer; hot burning material heats the next layer of cold material and ignites it. Most "fires" found in daily life, from flames to explosions, are deflagrations. Deflagration
Deflagration
is different from detonation, which propagates supersonically through shock waves. This means that when a substance detonates, it decomposes extremely quickly instead of deflagration. Black powder is an example of a substance that deflagrates when it is ignited.Contents1 Applications 2 Oil/wax fire and water 3 Flame
Flame
physics 4 Damaging events 5 See also 6 ReferencesApplications[edit] In engineering applications, deflagrations are easier to control than detonations
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Siege Of De'an
De'an County
De'an County
(Chinese: 德安县) is a county under Jiujiang City
Jiujiang City
in Jiangxi
Jiangxi
Province, China
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South Asia
South
South
Asia
Asia
or Southern Asia
Asia
(also known as Indian subcontinent) is a term used to represent the southern region of the Asian continent, which comprises the sub-Himalayan SAARC
SAARC
countries and, for some authorities, adjoining countries to the west and east. Topographically, it is dominated by the Indian Plate, which rises above sea level as Nepal
Nepal
and all parts of India
India
situated south of the Himalayas
Himalayas
and the Hindu
Hindu
Kush
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Gas Compression
A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor. Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe. As gases are compressible, the compressor also reduces the volume of a gas
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East Asia
East Asia
Asia
is the eastern subregion of Asia, defined in either geographical[2] or ethno-cultural[3] terms.[4][5] China, Japan, Korea, and Vietnam
Vietnam
belong to th
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Bamboo
The bamboos /bæmˈbuː/ ( listen) are evergreen perennial flowering plants in the subfamily Bambusoideae of the grass family Poaceae. In bamboo, as in other grasses, the internodal regions of the stem are usually hollow and the vascular bundles in the cross section are scattered throughout the stem instead of in a cylindrical arrangement. The dicotyledonous woody xylem is also absent. The absence of secondary growth wood causes the stems of monocots, including the palms and large bamboos, to be columnar rather than tapering.[3] Bamboos include some of the fastest-growing plants in the world,[4] due to a unique rhizome-dependent system. Certain species of bamboo can grow 91 cm (36 in) within a 24-hour period, at a rate of almost 4 cm (1.6 in) an hour (a growth around 1 mm every 90 seconds, or 1 inch every 40 minutes).[5] Giant bamboos are the largest members of the grass family
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Lead Shot
Shot is a collective term for small balls or pellets, often made of lead. These were the original projectiles for shotguns and are still fired primarily from shotguns and less commonly from riot guns and grenade launchers, although shot shells are available in many pistol calibers in a configuration called "bird shot", "rat-shot", or "snake shot". Lead
Lead
shot is also used for a variety of other purposes such as filling cavities with dense material for weight/balance. Some versions may be plated with other metals. Lead
Lead
shot was originally made by pouring molten lead through screens into water, forming what was known as "swan shot", and, later, more economically mass-produced at higher quality using a shot tower
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Air Gun
An air gun is any kind of gun that launches projectiles pneumatically with compressed air or other gases that are pressurized mechanically without involving any chemical reactions, in contrast to a firearm, which relies on an exothermic chemical oxidation (deflagration) of combustible propellants to generate propulsive energy. Both the long gun and handgun forms (air rifle and air pistol) typically propel metallic projectiles, that are either diabolo-shaped pellets, or spherical shots called BBs. Certain types of air guns (usually rifles) may also propel darts or arrows. The first air guns were developed as early as the 1500s. They have been used in hunting, sporting and warfare
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