The Heckler & Koch HK4 is a unique multi-caliber pocket pistol developed in 1966 and released in 1968. It could fire .22 LR, .25 ACP, .32 ACP, and .380 ACP rounds through interchangeable barrel and magazine kits. While innovative, its complex rimfire conversion and commercial competition from the Walther PPK limited its market success, despite a significant contract with the German Customs Police.
You've reached the end! 1 videos loaded.
Gun Laws by State
Read firearms regulations for all 50 states + D.C.
Find Gun Dealers
Search licensed FFL dealers near you.
