The HK4 is a historical firearm and marks the beginning of pistol production at Heckler & Koch. In its basic structure and the main manufacturing processes, the HK4 laid groundwork for its much more important and successful successor, the H&K P9S.

Discover the innovative Heckler & Koch HK4, a trailblazing semi-automatic pistol that redefined versatility in firearm design. With its unique ability to switch between four calibers – .22 LR, .25 ACP, .32 ACP, and .380 ACP – the HK4 offers unmatched …

Apr 2, 2020 · The pistol’s designation—HK4—identified a compact auto that could fire four different cartridges. They were .22 Long Rifle, .25 ACP, .32 ACP and .380 ACP. Americans appreciate a multiple...

The HK4 is a blow-back operated unlocked-breech semiautomatic pistol with a double-action trigger and an external hammer. Its name is derived from the tool-free interchangeability of the four barrels in calibers 9mm Browning Short, 7.65mm Browning, 6.35mm Browning and …

Jun 15, 2023 · The Heckler & Koch HK4 is a semi-automatic handgun chambered in .25 ACP and 9×17mm Kurz (or .380 ACP). It is the first of the “OG” series of handguns designed and manufactured by Heckler & Koch of Germany. The HK4 was introduced in 1968 and replaced the FN Model 1910 in the company’s catalog.

Sep 3, 2020 · The HK4, which offered the advantage of being multi-caliber, joined Heckler & Koch's early semi-auto hunting rifles and the company's P9 pistol in being the company's first range of imports to...

Dec 13, 2024 · I think the HK4 is a cool gun, more of a collectable though these days, rather than a practical shooter. The engineering and design is really cool and its similarity to the Mauser HSc it is largely a development from is interesting. The fact it was adopted as the P11 is also cool (some people collect all of the “P”’s).

The first pistol produced by the company, designated as the HK4 due to its modular frame design that allowed for changing the barrel, spring and magazine to accommodate four different calibers. The gun design was influenced by the Mauser Model HSc.

The first pistol produced by the company, designated as the HK4 due to its modular frame design that allowed for changing the barrel, spring and magazine to accommodate four different calibers. The gun design was influenced by the Mauser Model HSc.

It is an unlocked recoil loader with a spring-mass bolt action. It features a cocking trigger with a combined safety-release device. The Heckler & Koch HK 4 has the number "four" in its name because it can be quickly and easily converted to four different calibers.