Contents.History Heckler & Koch, encouraged by the success of the, developed a family of small arms consisting of four types of all based on a common G3 design layout and operating principle. The first type was chambered for, the second for the round, the third for the intermediate caliber, and the fourth type for the cartridge. The MP5 was created within the fourth group of firearms and was initially known as the HK54.Work on the MP5 began in 1964 and two years later it was adopted by the, border guard and army special forces.In 1980, the MP5 achieved iconic status as a result of its use on live television by SAS commandos in, where they stormed the Iranian Embassy in London, rescuing hostages and killing five terrorists. The MP5 has become a mainstay of units of law enforcement agencies in the United States since then. However, in the late 1990s, as a result of the, police special response teams have supplanted most MP5s with -based rifles.The MP5 is manufactured under license in several nations including Greece (formerly at EBO –, currently at ), , Mexico , , , , and the United Kingdom (initially at, later diverted to Heckler & Koch Great Britain). Design details The primary version of the MP5 family is the MP5A2, which is a lightweight, air-cooled, operated weapon with a roller-delayed bolt.
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It fires from a (bolt forward) position.The fixed, cold hammer-forged barrel has 6 right-hand grooves with a 1 in 250 mm (1:10 in) twist rate and is pressed and pinned into the receiver. Features. A view through the weapon's aperture sightThe first MP5 models used a double-column straight, but since 1977, slightly curved, magazines are used with a 15-round capacity (weighing 0.12 kg) or a 30-round capacity (0.17 kg empty).The adjustable (closed type) consist of a rotating rear diopter drum and a front post installed in a hooded ring. The rear sight is mechanically adjustable for both windage and elevation with the use of a special tool, being adjusted at the factory for firing at 25 metres (27 yd) with standard 8 grams (123 gr) FMJ 9×19mm NATO ammunition. The rear sight drum provides four apertures of varying diameters used to adjust the diopter system, according to the user's preference and tactical situation. Changing between apertures does not change the point of impact down range.
For accurate shooting the user should select the smallest aperture that still allows an equal circle of light between the rear sight aperture and the outside of the front sight hood ring. The roller-delayed blowback mechanism originated from the aborted prototypes developed in at the end of.The bolt rigidly engages the barrel extension—a cylindrical component welded to the into which the barrel is pinned. The delay mechanism is of the same design as that used in the. The two-part bolt consists of a bolt head with rollers and a bolt carrier. The heavier bolt carrier lies up against the bolt head when the weapon is ready to fire and inclined planes on the front locking piece lie between the rollers and force them out into recesses in the barrel extension.When fired, expanding propellant gases produced from the burning powder in the exert rearward pressure on the bolt head transferred through the base of the cartridge case as it is propelled out of the. A portion of this force is transmitted through the rollers projecting from the bolt head, which are cammed inward against the inclined flanks of the locking recesses in the barrel extension and to the angled shoulders of the locking piece.
The selected angles of the recesses and the incline on the locking piece produce a velocity ratio of about 4:1 between the bolt carrier and the bolt head. This results in a calculated delay, allowing the projectile to exit the barrel and gas pressure to drop to a safe level before the case is extracted from the chamber.The delay results from the amount of time it takes for enough recoil energy to be transferred through to the bolt carrier in a sufficient quantity for it to be driven to the rear against the force of inertia of the bolt carrier and the forward pressure exerted against the bolt by the recoil spring. As the rollers are forced inward they displace the locking piece and propel the bolt carrier to the rear. The bolt carrier's rearward velocity is four times that of the bolt head since the cartridge remains in the chamber for a short period of time during the initial recoil impulse.
After the bolt carrier has traveled rearward 4 mm, the locking piece is withdrawn fully from the bolt head and the rollers are compressed into the bolt head. Only once the locking rollers are fully cammed into the bolt head can the entire bolt group continue its rearward movement in the receiver, breaking the seal in the chamber and continuing the feeding cycle.Since the cartridge is relatively low powered, the bolt does not have an anti-bounce device like the G3, but instead the bolt carrier contains granules that prevent the bolt group from bouncing back after impacting the barrel extension. The weapon has a fluted chamber that enhances extraction reliability by bleeding gases backwards into the shallow flutes running along the length of the chamber to prevent the cartridge case from expanding and sticking to the chamber walls (since the bolt is opened under relatively high barrel pressure). A spring extractor is installed inside the bolt head and holds the case securely until it strikes the ejector arm and is thrown out of the ejection port to the right of the receiver. The lever-type ejector is located inside the trigger housing (activated by the movement of the recoiling bolt). Accessories In the early 1970s, introduced a conversion kit for the MP5 that enables it to use rimfire ammunition.
This unit consists of a barrel insert, a bolt group and two 20-round magazines. This modification reduces the cyclic rate to 650 rounds/min.
It was sold mostly to law enforcement agencies as a way to train recruits on handling the MP5. It used ammunition that was cheaper and had a lower recoil than 9×19mm Parabellum. This reduced training costs and built up skill and confidence in the operators before transitioning them to the full-bore model.Barrel accessories. Cutshaw, Charles Q. (28 February 2011). Iola, Wisconsin: Gun Digest Books.
(2007). New York: Penguin Group (USA) Incorporated. Ezell, Edward Clinton; Smith, Walter Harold Black; Smith, Joseph Edward (1973). Small Arms of the World: A Basic Manual of Small Arms, the Classic (121 ed.). Woodbridge, Virginia: Stackpole Books. James, Frank W.
(1 January 2003). Iola, Wisconsin: Krause Publications. Jones, Richard D.; Ness, Leland S., eds.
Jane's Infantry Weapons 2009/2010 (35th ed.). Coulsdon: Jane's Information Group. Rottman, Gordon L. Osprey Publishing.
Thompson, Leroy (20 July 2014). Osprey Publishing. Tilstra, Russell C. US: McFarland. Archived from on 2012-05-09.External links has media related to.
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Number of employees923 (2018)WebsiteHeckler & Koch GmbH ( HK) ( German pronunciation: ) is a German manufacturing that manufactures,. The company is located in in the of, and also has subsidiaries in the United Kingdom, France and the United States.The Heckler & Koch Group comprises Heckler & Koch GmbH, Heckler & Koch Defense, NSAF Ltd., and Heckler & Koch France SAS. The company's motto is ' Keine Kompromisse!' (No Compromises!). HK provides firearms for many military and paramilitary units, including the, the US, Canada's, the German and and many other counter-terrorist and hostage rescue teams.Their more notable products include the, the, the, the, the, the series of, and the high-precision. All HK firearms are named by a prefix and the official designation, with suffixes used for variants.HK has a history of innovation in firearms, such as the use of in weapon designs and the use of an integral rail for flashlights on handguns. HK also developed modern, noted for its high accuracy, increased muzzle velocity and barrel life.
Not all its technologically ambitious designs have become commercially successful products (for instance, the advanced but now abandoned military rifle, which fired high-velocity ammunition). In its extensive product range, HK has used the following operating systems for small arms:, and (via Short-stroke piston). Contents.History With the fall of Germany at the end of World War II, came under French control, and the entire factory was dismantled by French occupying forces. All factory records were destroyed on orders of the local French Army commander. In 1948, three former Mauser engineers, and, saved what they could from the factory and used what they salvaged to start a machine tool plant in the vacant factory that became known as the Engineering Office Heckler & Co.On December 28, 1949, the Engineering Office Heckler & Co. Changed its name and was registered officially as Heckler & Koch GmbH. Initially the new company manufactured machine tools, bicycle and parts, gauges and other precision parts.In 1956, Heckler & Koch responded to the government's tender for a new infantry rifle for the (German Federal Army) with the proposal of the, which was based on the Spanish rifle.
The German government awarded Heckler & Koch the tender and by 1959 declared the G3 the standard rifle of the Bundeswehr. In 1961, Heckler & Koch developed the 7.62×51mm, based on the G3 battle rifle.In 1966, Heckler & Koch introduced the HK54 machine pistol, which eventually launched in 1969 as the. Two years later, the company introduced the 5.56×45mm assault rifle, a smaller version of the G3 battle rifle chambered in 5.56mm NATO.
Diversification In 1974, Heckler & Koch diversified into two more areas, HK Defense and Law Enforcement Technology and HK Hunting and Sports Firearms. Since then HK has designed and manufactured more than 100 different types of firearms and devices for the world's military and law enforcement organizations as well as sports shooters and hunters.In 1990, Heckler & Koch completed two decades of development of their revolutionary caseless weapon system and produced prototypes of the. The company also produced prototypes of the intended for the Bundeswehr.
Due to the international political climate at the time (East and West Germany uniting and defense budget cuts) the company was unable to secure funded contracts from the German government to support production of either weapon system and became financially vulnerable. The next year, Heckler & Koch was sold to the 's division.During 1994 and 1995, the German government awarded Heckler & Koch contracts for producing an updated standard assault rifle and updated standard sidearm for the Bundeswehr. Heckler & Koch developed and produced the Project HK50, a lightweight –reinforced polymer, which became the. In addition, Heckler & Koch produced the derived as a variant of its Universale Selbstladepistole (USP) series of handguns (which had been in production since 1989). The P8 was adopted as the standard handgun for the Bundeswehr in 1994 and the G36 in 1995.As the result of a 1999 merger between British Aerospace and, Heckler & Koch was owned by and contracted to refurbish the rifle for the.
This contract entailed a modification programme to the SA80 series of rifles to address a number of reliability issues with the SA80. In 2002, BAE Systems restructured and sold Heckler & Koch to a group of private investors, who created the German group holding company HK Beteiligungs GmbH.In 2003, HK Beteiligungs GmbH's business organization restructured as Heckler & Koch Jagd und Sportwaffen GmbH (HKJS) and its business was separated into the two business areas similar to the 1974 business mission areas, Defense and Law Enforcement and Sporting Firearms.In 2004, Heckler & Koch was awarded a major handgun contract for the, worth a potential $26.2 million for up to 65,000 handguns. This contract ranks as the single largest handgun procurement contract in US law enforcement history.