The HK4: H&K's First Pistol (Four Calibers, One Gun)
This video explores the Heckler & Koch HK4, H&K's first pistol introduced in the mid-1960s. The HK4 was a unique caliber-convertible handgun, allowing users to switch between .380, .32, .25, and .22 cartridges with quick modifications. While not a commercial success, the HK4 represented H&K's entry into the pistol market. The video highlights its design and historical significance, acknowledging Ventura Munitions for their support and encouraging viewers to support TFBTV on Patreon.










