Heckler & Koch GmbH (HK) is a German defense manufacturing company producing handguns, assault rifles, submachine guns, and grenade launchers.
The Heckler & Koch Group comprises Heckler & Koch GmbH, Heckler & Koch Defense, NSAF Ltd., and Heckler & Koch France SAS.
Some of their products include the MP5 SMG, the G3 battle rifle, the G36 AR, the HK416 AR, the MP7 PDW, the UMP SMG, the USP series of handguns, and the high-precision PSG1 sniper rifle. All firearms made by HK 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 polymers in weapon designs and the use of an integral rail for flashlights on handguns. HK also developed modern polygonal rifling, noted for its high accuracy, increased muzzle velocity and barrel life. Not all of its technologically ambitious designs have translated into commercially successful products (for instance, the advanced but now abandoned G11 assault rifle, which fired caseless high-velocity ammunition). HK produces small arms ranging from handguns to machine guns and grenade launchers. In its extensive product range, HK has used the following operating systems for small arms: blowback operation, short-recoil, roller-delayed blowback, gas-delayed blowback, and gas operation.
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