HECKLER & KOCH HK-4 For Sale

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The Heckler & Koch HK-4 is a compact, semi-automatic pistol produced from 1968 to 1973, renowned for its versatility in converting between four calibers: .22 Long Rifle, .25 ACP, .32 ACP, and .380 ACP. The first variation, made from 1968 to the early 1970s, featured a traditional design with a steel slide and aluminum alloy frame, marked “HK-4” with the caliber on the slide, and equipped with plastic checkered grips and a rounded hammer. It also included interchangeable barrels and magazines for each caliber. The second variation, produced from the early 1970s to 1973, introduced aesthetic updates such as refined grip textures and enhanced slide serrations, functional improvements for better reliability and easier caliber conversion, and standardized markings including a thumb rest spur on the hammer for improved safety. Overall, the HK-4’s robust construction and multi-caliber capability make it a prized firearm among collectors, showcasing Heckler & Koch’s dedication to quality and engineering excellence.

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