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Fluting (firearms)
Fluting is the removal of material from a cylindrical surface in a firearm, usually creating grooves. This is most often the barrel of a rifle, though it may also refer to the cylinder of a revolver or the bolt of a bolt action rifle. In contrast to rifle barrels and revolver cylinders, rifle bolts are normally helically fluted, though helical fluting is sometimes also applied to rifle barrels. Purpose The main purpose of fluting is to reduce weight, and to a lesser extent increase rigidity for a given total weight or increase surface area to make the barrels less susceptible for overheating for a given total weight. However, for a given diameter, while a fluted barrel may cool more quickly, a non-fluted barrel will be stiffer and be able to absorb a larger amount of total heat at the price of additional total weight. In barrel chamber In the barrel chamber, fluting refers to gas relief flutes/grooves used to ease the extraction of cartridges. They may also come in annu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blowback (firearms)
Blowback is a system of operation for self-loading firearms that obtains energy from the motion of the cartridge case as it is pushed to the rear by expanding gas created by the ignition of the propellant charge. Several blowback systems exist within this broad principle of operation, each distinguished by the methods used to control bolt movement. In most actions that use blowback operation, the breech is not locked mechanically at the time of firing: the inertia of the bolt and recoil , relative to the weight of the bullet, delay opening of the breech until the bullet has left the barrel. A few locked breech designs use a form of blowback (example: primer actuation) to perform the unlocking function. The blowback principle may be considered a simplified form of gas operation, since the cartridge case behaves like a piston driven by the powder gases. Other operating principles for self-loading firearms include delayed blowback, blow forward, gas operation, and recoil op ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
G22 Ohne Schalldaempfer
G, or g, is the seventh letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages, and others worldwide. Its name in English is ''gee'' (pronounced ), plural ''gees''. The lowercase version can be written in two forms: the single-storey (sometimes "opentail") and the double-storey (sometimes "looptail") . The former is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children. History The evolution of the Latin alphabet's G can be traced back to the Latin alphabet's predecessor, the Greek alphabet. The voiced velar stop was represented by the third letter of the Greek alphabet, gamma (Γ), which was later adopted by the Etruscan language. Latin then borrowed this "rounded form" of gamma, C, to represent the same sound in words such as ''recei'', which was likely an early dative form of '' rex'', meaning "king", as found in an "early Latin inscription." Over time, how ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diameter
In geometry, a diameter of a circle is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle. It can also be defined as the longest Chord (geometry), chord of the circle. Both definitions are also valid for the diameter of a sphere. In more modern usage, the length d of a diameter is also called the diameter. In this sense one speaks of diameter rather than diameter (which refers to the line segment itself), because all diameters of a circle or sphere have the same length, this being twice the radius r. :d = 2r \qquad\text\qquad r = \frac. The word "diameter" is derived from (), "diameter of a circle", from (), "across, through" and (), "measure". It is often abbreviated \text, \text, d, or \varnothing. Constructions With straightedge and compass, a diameter of a given circle can be constructed as the perpendicular bisector of an arbitrary chord. Drawing two diameters in this way can be used to locate the center of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Squeeze Bore
A squeeze bore, alternatively taper-bore, cone barrel or conical barrel, is a weapon where the internal gun barrel, barrel diameter progressively decreases towards the muzzle (firearms), muzzle, resulting in a reduced final internal diameter. These weapons are used in conjunction with special sub-caliber ammunition where the projectile is fitted with soft-metal flanges which fills out the caliber. As the projectile travels through the squeeze bore, the flanges fold inwards, resulting in a reduced caliber round with an increased velocity compared to a traditional full-caliber round. Mechanism A squeeze bore utilizes the energy of the propellant to squeeze the diameter of the bullet or shell (projectile), shell down, increasing penetration and velocity significantly. This process also means high chamber pressure and low barrel service life. For example, the service life of a squeeze bore 7.5 cm Pak 41 could be as low as 1000 rounds compared to 5000–7000 rounds for the 7.5 cm Pak 3 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
StG 45(M)
The StG 45(M) (abbreviation of Sturmgewehr 45, "Assault Rifle 45") sometimes referred to as the MP 45(M), was a prototype assault rifle developed by Mauser for the ''Wehrmacht'' at the end of World War II, using an innovative roller-delayed blowback operating system. It fired the 7.92×33mm Kurz (or "Pistolenpatrone 7.9mm") intermediate cartridge at a cyclic rate of around 450 rounds per minute. Overview The origin of this rifle can be traced back to the final years of World War II when Mauser engineers at the Light Weapon Development Group (''Abteilung 37'') at Oberndorf am Neckar designed the MKb ''Gerät'' 06 (''Maschinenkarabiner Gerät 06'' or "machine carbine device 06") prototype assault rifle chambered for the intermediate 7.92×33mm Kurz cartridge, first with the ''Gerät'' 06 model using a roller-locked mechanism which was unique for being gas operated, as opposed to recoil operation, originally adapted from the MG 42 machine gun, but with a fixed barrel and con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AA-52 Machine Gun
The term AA-5 or AA5 may refer to: * AA-5 Ash, NATO reporting name for the Bisnovat R-4 a Soviet long-range air-to-air missile * Grumman American AA-5, an American light aircraft * All American Five, a basic design for a mass-produced superheterodyne radio using five tubes * ''Phoenix Wright: Ace Attorney – Dual Destinies'', also referred to as ''Ace Attorney 5'' * Gardiner's List of hieroglyphs/AA, designated symbol for the hieroglyph for a part of steering gear of a ship {{DEFAULTSORT:Aa5 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FAMAS
The FAMAS ( French: ''Fusil d'Assaut de la Manufacture d'Armes de Saint-Étienne'', lit. 'Assault rifle from the Saint-Étienne Weapon Factory') is a bullpup assault rifle designed and manufactured in France by MAS in 1978. It is known by French troops as ''Le Clairon'' (The Bugle) due to its distinctive shape. The FAMAS is known for its high rate of fire of around 900–1,100 rounds per minute. Beginning in 2017, the FAMAS was replaced in most frontline units in the French Army by the HK416F, and the FAMAS is expected to remain in limited service until 2028. History The first French bullpup rifles were developed between 1946 and 1950 at the AME (''Atelier Mécanique de Mulhouse'') and MAS, testing rounds such as .30 US Carbine, 7.92×33mm Kurz, 7.65×38mm (Made by ''Cartoucherie de Valence'') and some other intermediate calibres. Since France was engaged in the First Indochina War at the time, and was also the second-largest contributor to NATO, the research budgets ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heckler & Koch G3
The Heckler & Koch G3 () is a selective fire, select-fire battle rifle chambered in 7.62×51mm NATO developed in the 1950s by the German firearms manufacturer Heckler & Koch, in collaboration with the Spanish state-owned firearms manufacturer CETME. The G3 was the service rifle of the German ''Bundeswehr'' until it was replaced by the Heckler & Koch G36 in the 1990s, and was adopted into service with numerous other countries. The G3 has been exported to over 70 countries and manufactured under license in at least 15 countries. Over 7.8 million G3s have been produced. Its modular design was used for several other HK firearm models, including the Heckler & Koch HK21, HK21, Heckler & Koch MP5, MP5, Heckler & Koch HK33, HK33, Heckler & Koch PSG1, PSG1, and Heckler & Koch G41, G41. History The origin of the G3 can be traced back to the final years of World War II when Mauser engineers at the Light Weapon Development Group (''Abteilung 37'') at Oberndorf am Neckar designed the ''Mas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chamber (firearms)
The chamber of a firearm is the cavity at the back end of a breechloading weapon's barrel or cylinder, where the ammunition is inserted before being fired. The rear opening of the chamber is the breech, and is sealed by the breechblock or the bolt. Function The act of ''chambering'' a cartridge means the insertion of a round into the chamber, either manually or through the action of the weapon, e.g., pump-action, lever-action, bolt action, or autoloading operation generally in anticipation of firing the weapon, without need to "load" the weapon upon decision to use it (reducing the number of ''actions'' needed to discharge). Automatic and single-shot pistols (such as Derringers), rifles, and shotguns generally have a single chamber integral to their barrels, but revolvers have multiple chambers in their cylinder, and no chamber in their barrel. Thus, pistols, rifles, and shotguns can usually still be fired with the magazine removed as long as a cartridge is inser ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DCB Shooting G3 Roller System3
DCB may stand for: * Dame Commander of the Order of the Bath * Development Credit Bank, a private-sector bank in India * David Campbell Bannerman (born 1960), a British politician * David Crowder Band, a Christian rock band * ''Dictionary of Canadian Biography'' * Dulwich College Beijing, a British international school in Beijing, China * Dope Circle Boyz, a Finnish hip-hop group In science and technology * Disconnecting circuit breaker, a high-voltage circuit breaker with disconnectors integrated into the breaking chamber * Data center bridging, in computer networking * Data Control Block, a data structure for accessing data sets on IBM mainframes * Double Cantilever Beam, a test specimen in fracture mechanics * Dichlorobenzene * Digital Control Bus, a proprietary MIDI-like interface by Roland Corporation * Direct Copper Bonding, also Direct Bonding Copper, a type of power electronic substrate * Direct Carrier Billing, a method of doing digital financial transactions * D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermal Shock
Thermal shock is a phenomenon characterized by a rapid change in temperature that results in a transient mechanical load on an object. The load is caused by the differential expansion of different parts of the object due to the temperature change. This differential expansion can be understood in terms of strain, rather than stress. When the strain exceeds the tensile strength of the material, it can cause cracks to form, and eventually lead to structural failure. Methods to prevent thermal shock include: * Minimizing the thermal gradient by changing the temperature gradually * Increasing the thermal conductivity of the material * Reducing the coefficient of thermal expansion of the material * Increasing the strength of the material * Introducing compressive stress in the material, such as in tempered glass * Decreasing the Young's modulus of the material * Increasing the toughness of the material through crack tip blunting or crack deflection, utilizing the process of pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
