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Closed Bolt
A semi or full-automatic firearm which is said to fire from a closed bolt or closed breech is one where, when ready to fire, a round is in the chamber and the bolt and working parts are forward ''in battery''. When the trigger is pulled, the firing pin or striker fires the round; the action is cycled by the energy of the shot, sending the bolt to the rear, which extracts and ejects the empty cartridge case; and the bolt goes forward, feeding a fresh round from the magazine into the chamber, ready for the next shot. World War I aircraft When World War I era machine guns were being tried for use on aircraft, the Lewis gun was found not to be usable with a gun synchronizer for forward firing through the propeller, due to its firing cycle starting with an open bolt. Maxim style arms fired with a cycle starting with a closed bolt, and since the bullet firing from the gun started the firing cycle, it was much easier to set the synchronizer to trigger the gun only when the prope ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gewehr G36 NoBG
is the German word for a long-barreled firearm such as a rifle or shotgun. The word is also used extensive in German to form compound words that describe specific types of service weapons, such as (sniper rifle), (assault rifle) and ( machine gun). Prior to the 1840s, rifled guns were not widespread, and firearms are smoothbore muzzleloaders termed , a term that are still used in German hunting jargons today. Etymologically, the word "" is related to "fighting" or "guarding", and so became the standard term for military-type weapons. The term "Gewehr" can be encountered in the context of 19th and 20th century military history for nonspecific rifles from German-speaking countries, e.g. in arms trade, in particular for types produced before German unification in 1871. Specific types, sorted chronologically from 1841 to 1997 and with designer given, are: * Gewehr 41 (Dreyse, 1841) * Gewehr 71 (Mauser, 1871) * Gewehr 88 (state committee, 1888) * Gewehr 98 (Mauser, 1898) * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
M1895 Colt–Browning Machine Gun
The Colt–Browning M1895, nicknamed "potato digger" because of its unusual operating mechanism, is an air-cooled, belt-fed, gas-operated machine gun that fires from a closed bolt with a cyclic rate of 450 rounds per minute. Based on an 1889 design by John Browning and his brother Matthew S. Browning, it was the first successful gas-operated reloading, gas-operated machine gun to enter service. Operating mechanism Filed for patent in 1892, the M1895's operating mechanism is one of John Browning, John and Matthew S. Browning's early patents for automatic rifles; they had previously been working on lever-action rifles for Winchester such as the Winchester rifle#Model 1886, Winchester 1886. In a typical lever-action design, the operating lever lies under the rear of the gun, typically below the stock, and is hinged near the breech area. It is operated by rotating the lever down and forward, which causes the breechblock to slide rearward away from the barrel and eject the spent rou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FN F2000
The FN F2000 is a 5.56×45mm NATO bullpup rifle, designed by FN Herstal in Belgium. Its compact bullpup design includes a telescopic sight, a non-adjustable fixed notch and front blade secondary sight. The weapon has fully ambidextrous controls, allowed by a unique ejection system, ejecting spent cartridge casings forward and to the right side of the weapon, through a tube running above the barrel. The F2000 made its debut in March 2001 at the IDEX defence exhibition held in Abu Dhabi, in the United Arab Emirates. Design details The F2000 is a modular weapon system; its principal component is a compact 5.56×45mm NATO-caliber assault rifle in a bullpup configuration. The F2000 is a selective fire weapon operating from a closed bolt. The rifle consists of two main assemblies: the barreled receiver group and the frame, coupled together by means of an axis pin located above the trigger guard. The barrel group has an integral MIL-STD-1913 Picatinny rail used to mount optical sig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FAMAE SAF
The FAMAE SAF is a submachine gun produced and manufactured by FAMAE (''Fábricas y Maestranzas del Ejército'') since 1993. Since 1999, Taurus have produced the SAF under license in .40 S&W for Brazilian law enforcement. Semi-automatic-only variants manufactured by FAMAE are mostly marketed for sale in Canada. Design The SAF is a blowback-operated select-fire submachine gun, firing from a closed bolt. It is based on the Swiss SIG SG 540 assault rifle which was produced under license in Chile in the 1980s. The design is a shortened version of the SIG 540 rifle, but the rifle's rotating bolt has been replaced with a simple Blowback (arms), blowback bolt. The SAF also has a bolt hold-open catch that engages after the final shot. Otherwise, the receiver, stock, fore-end, trigger/hammer assembly and floating firing pin design are from the SIG 540. (It also retains the folding trigger guard for winter glove use.) The upper and lower receiver as well as the trigger guard are steel, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Armalite AR-16
The AR-16 was an American battle rifle produced by ArmaLite. History The AR-16 was developed shortly after ArmaLite's previous rifle, the AR-15. It was designed by Eugene Stoner in 1959 and unlike the AR-15, it was not intended for domestic use by the US Army; it was instead marketed towards emerging nations with a limited industrial base. The 7.62×51mm cartridge was selected for the AR-16, rather than the 5.56×45mm cartridge which had recently been standardized by NATO, because it was perceived that the AR-16's intended customers would be still reliant on 7.62mm and unwilling to buy 5.56mm rifles. In a marketing ploy, ArmaLite also emphasized that the machine tools used to produce the gun could be re-purposed for agricultural and office purposes. The AR-16 was briefly marketed in the early 1960s but never entered full production due to a lack of sales. There was very little interest in the design, as most NATO member states were in the process of adopting the 5.56×45mm car ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Armalite AR-10
The ArmaLite AR-10 is a 7.62×51mm NATO battle rifle designed by Eugene Stoner in the late 1950s and manufactured by ArmaLite (then a division of the Fairchild (aircraft manufacturer), Fairchild Aircraft Corporation). When first introduced in 1956, the AR-10 used an innovative combination of a straight-line barrel/stock design with Phenol formaldehyde resin#Applications, phenolic composite, a new patent-filed gas-operated bolt and carrier system and forged alloy parts resulting in a small arm significantly easier to control in automatic fire and over lighter than other infantry rifles of the day. Over its production life, the original AR-10 was built in relatively small numbers, with fewer than 10,000 rifles assembled. However, the ArmaLite AR-10 would become the progenitor for a wide range of firearms. In 1957, the basic AR-10 design was rescaled and substantially modified by ArmaLite to accommodate the .223 Remington cartridge, and given the designation ArmaLite AR-15. In 1959, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rifle
A rifle is a long gun, long-barreled firearm designed for accurate shooting and higher stopping power, with a gun barrel, barrel that has a helical or spiralling pattern of grooves (rifling) cut into the bore wall. In keeping with their focus on accuracy, rifles are typically designed to be held with both hands and braced firmly against the shooter's shoulder via a buttstock for stability during shooting. Rifles are used in warfare, law enforcement, hunting and shooting sports, target shooting sports. The invention of rifling separated such firearms from the earlier smoothbore weapons (e.g., arquebuses, muskets, and other long guns), greatly elevating their accuracy and general effectiveness. The raised areas of a barrel's rifling are called ''lands''; they make contact with and exert torque on the projectile as it moves down the bore, imparting a spin. When the projectile leaves the barrel, this spin persists and lends gyroscopic stability to the projectile due to conservatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cooking Off
Cooking off (or thermally induced firing) is unfired weapon ammunition explosion, exploding prematurely due to heat in the surrounding environment. The term is used both for detonation of ammunition not loaded into a weapon, and unintended firing of a loaded weapon due to heating. A fast cook-off is a cook-off caused by fire. A slow cook-off is caused by a sustained thermal event less intense than fire. A cooked-off round may cause a sympathetic detonation of adjacent rounds. Insensitive munitions are designed to be less vulnerable to accidental firing induced by external heat. Artillery Inherent design flaws in early 17th century Sweden, Swedish leather cannons led to the gun barrel, gun tube overheating which prematurely ignited the gunpowder, injuring the loader. Muzzle-loading cannon on merchant and naval vessels of the Age of Sail would fire if the vessels caught fire while the guns were loaded. Examples include the merchantman and . After the cooking off of artillery ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dissipation
In thermodynamics, dissipation is the result of an irreversible process that affects a thermodynamic system. In a dissipative process, energy ( internal, bulk flow kinetic, or system potential) transforms from an initial form to a final form, where the capacity of the final form to do thermodynamic work is less than that of the initial form. For example, transfer of energy as heat is dissipative because it is a transfer of energy other than by thermodynamic work or by transfer of matter, and spreads previously concentrated energy. Following the second law of thermodynamics, in conduction and radiation from one body to another, the entropy varies with temperature (reduces the capacity of the combination of the two bodies to do work), but never decreases in an isolated system. In mechanical engineering, dissipation is the irreversible conversion of mechanical energy into thermal energy with an associated increase in entropy. Processes with defined local temperature produce ent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
