High Standard HDM
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,[citation needed] full-metal-jacketed .22 LR rounds were developed for this pistol.William J. Donovan demonstrated the pistol to President Franklin D. Roosevelt inside the Oval Office.[1] Francis Gary Powers' HDM is displayed in Moscow after his capture and release at the Central Armed Forces Museum as of 2017.[2][3] The High Standard HDM is a conventional blowback-operated semi-automatic pistol fitted with an integral silencer which decreases its report by more than 20 dB.