HK 4
The Heckler&Koch HK 4 (P11 in German military issue) semiauto pistol was introduced in 1967, and wen out of production in 1984. It is a large sized pocket pistol, designed to interchange between .22 LR, .25 ACP (6.35mm), .32 ACP (7.65mm) and .380 ACP (9mm Kurz), (8 rounds each except .380 for which the mag capacity is 7) by replacing only the barrel and magazine.
Picture and information courtesy of: Pierangelo Tendas
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