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The HK33 is a 5.56mm assault rifle developed in the 1960s by West German armament manufacturer Heckler & Koch GmbH (H&K), primarily for export.

Capitalizing on the success of their G3 design, the company developed a family of small arms (all using the G3 operating principle and basic design concept) consisting of four types of firearms: the first type, chambered in 7.62x51mm NATO, the second—using the Soviet 7.62x39mm M43 round, third—the intermediate 5.56x45mm caliber and the fourth type—chambered for the 9x19mm Parabellum pistol cartridge.

The HK33 series of rifles were adopted by the Brazilian Air Force (Força Aérea Brasileira or FAB), the armed forces of Thailand and Malaysia where they were produced under a license agreement. The rifle was also license-built in France by MAS and in Turkey by MKEK. The HK33 is no longer manufactured or marketed by Heckler & Koch.

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