| High Standard HDM | |
|---|---|
| Type | Suppressed semi-automatic pistol |
| Place of origin | United States |
| Service history | |
| In service | 1942–1951 |
| Used by | See Users |
| Wars | World War II, Cold War, Gulf War, Vietnam War |
| Production history | |
| Manufacturer | High Standard Manufacturing Company |
| Specifications | |
| Mass | 47 oz (1,300 g), empty |
| Length | 13.815 inches (351 mm) Suppressor length × diameter= 7.75 in (197 mm) by 1 in (25 mm) |
| Barrel length | 6.75 in (171 mm) |
| Height | 5 in (127 mm) |
| Cartridge | .22 LR (5.6mm rimfire) |
| Action | Blowback, semi-automatic |
| Rate of fire | Semi-automatic |
| Muzzle velocity | 1,080 ft/s (329 m/s) |
| Feed system | 10-round single column, detachable box magazine |
| Sights | fixed Iron sights |
The High Standard HDM is an American semi-automatic pistol equipped with an integral silencer. Based on the High Standard H-D pistol, it was adopted by the Office of Strategic Services (OSS) during World War II. Because of legal concerns during wartime, full-metal-jacketed .22 LR rounds were developed for this pistol.