- For the military variant, see Heckler & Koch HK33.
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H&K introduced a semi automatic version of the HK33 in 1974 as the HK43.
In 1975, the HK93 was introduced shortly after the HK43.
HK43KA1: A shortened version with a 322mm barrel (12.6 inches) was produced in 1977.
HK43A2: Variant with a rigid synthetic stock.
HK43A3: Standard rifle but with telescoping metal stock.