Heckler & Koch HK4
The HK4 is a pocket pistol, first introduced by Heckler & Koch in either 1964 or 1967. It was distinctive for allowing shooters to swap barrels chambered for different cartridges without tools and for having a durable but light hard-anodized aluminum-alloy frame.
| HK4 | |
|---|---|
H&K HK4 on display | |
| Type | Semi-automatic pistol |
| Place of origin | West Germany |
| Service history | |
| Used by | See Users |
| Production history | |
| Designer | Alex Seidel |
| Designed | 1963 |
| Manufacturer | Heckler & Koch, MAS |
| Produced | 1964 or 1967-1984 |
| Specifications | |
| Mass | 480 g (17 oz) |
| Length | 157 mm (6.2 in) |
| Barrel length | 85 mm (3.3 in) |
| Width | 32 mm (1.3 in) |
| Height | 110 mm (4.3 in) |
| Cartridge | .22 Long Rifle .25 ACP .32 ACP .380 ACP |
| Action | Straight blowback, unlocked breech |
| Muzzle velocity | 356 m/s (MAG-95, MAG-98, MAG-98c) |
| Effective firing range | Sights ranged for 25 m |
| Feed system | 7, 8-round box magazine |
| Sights | Fixed, front post and rear notch, sight radius 121 mm |
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