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The Heckler & Koch MG4 (also known as the HK123) is a belt-fed 5.56 mm light machine gun designed and developed by German firearm manufacturer Heckler & Koch.It was developed in the late 1990s and first seen publicly in September 2001.
The HK4 is a historical firearm and marks the beginning of pistol production at Heckler & Koch. In its basic structure and the main manufacturing processes, the HK4 laid groundwork for its much more important and successful successor, the H&K P9S.
It was designed to use G3-type 10- or 20-round box magazines in the designated marksman role, but could also use a special 50-round drum magazine for sustained supporting or suppressing fire. The modified G8A1 adopted the improvements of the HK11A1 series and was only able to feed from magazines and drums.
The Gurttrommel is not a true magazine but holds a curled 50-round belt preventing it from snagging, twisting and getting stuck during mobile assaults. Alternatively, the MG5 can be fed with 80-round cloth ammunition pouches or a Gurtkasten (belt box) containing 120 rounds and fitted to the left side of the receiver or from stand-alone ...
The sides have interlocking studs that allow the magazines to be attached jungle-style. An empty G36 magazine weighs 127 g (4.5 oz), while a fully loaded magazine weighs 483 g (17.0 oz). [citation needed] While STANAG magazines are not normally compatible with the G36, adapters and modifications exist that enable cross-compatibility.
The G3A3 (A4) uses either steel (260 g) or aluminium (140 g) 20-round double-stacked straight box magazines, or a 50-round drum magazine. H&K developed a prototype plastic disposable magazine in the early 1960s, but it was not adopted as aluminum magazines were just as light and proved more durable, as well as easier to produce.
The rear of the USP grip is stepped, and combines with the tapered magazine to allow for rapid reloading. Finger recesses in the grip frame also aid in magazine removal. On 9 mm and .40 caliber USPs, magazines are constructed of polymer reinforced with stainless steel. Magazines on the USP45 are all-metal.
The MP7 allows a conventional 20, 30 or 40-round box magazine to be fitted within the pistol grip (the 20-round magazine is comparable in size to a 15-round 9×19mm magazine, while the 40-round magazine compares to a 30-round 9×19mm magazine). It features an ambidextrous fire selector, bolt catch lever and magazine release.