The MP5, or the Maschinenpistole 5, is a submachine gun that was developed in West Germany in the mid-20th century. It was first introduced in 1966 and has since become one of the most widely used submachine guns in the world. The MP5 was developed by Heckler & Koch. It was designed to replace the aging MP4 submachine gun, which had been in service with the German military since the 1950s.

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The MP5 has a distinctive design, with a curved magazine, drum sights, and a retractable stock. It is chambered for the 9x19mm Parabellum cartridge. This weapon features a roller delayed blowback operation system and has a selective fire capability firing in semi-automatic, three-round bursts, or fully automatic fire at 800 rounds per minute. Over the years, the MP5 has undergone numerous upgrades and refinements. The weapon has been adapted for a wide range of ammunition types, including the 10mm Auto, .40 S&W, and .45 ACP. The MP5 has also been adapted for use with a wide range of accessories and attachments, including tactical flashlights, suppressors, and laser sights. The standard magazine capacity of the MP5 is 30 rounds, although there are also 15 and 10-round magazines available.

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The MP5 can be identified by the “HK” manufacturing stamp on the right side of the mag well and which caliber it is chambered for on the left . The “HK” stamp is also located on the bolt carrier along with the serial number. The serial number can also be located on top of the upper receiver, just forward of the rear drum sight.

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The MP5 was first used by the German military in the 1970s and quickly gained a reputation as a highly effective weapon. It was used by special forces units around the world, including the British SAS and the US Navy SEALs. It was also used by law enforcement agencies, particularly in the fight against terrorism.