The HK4 was HK’s first pistol and was a development of the Mauser HSc, which was in turn based on the Walther PPK and served German forces in WW2.
The HK4 is truly a unique pistol because it can chamber four calibers: .380 ACP, .32 ACP, .25 ACP, and .22 LR. The pistol shipped with a different barrel and magazine for each caliber, which was unlike any other pistol made back then and remains so today.
The HK4 was produced from the 1960s through the 1980s. Today, it remains a very popular collector’s piece.
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