This was the 13th appearance of what had been standardised in 1948 as the men's
ISSF 25 meter rapid fire pistol event, the only event on the 2020 programme that traces back to 1896. The event has been held at every Summer Olympics except 1904 and 1928 (when no shooting events were held) and 1908; it was nominally open to women from 1968 to 1980, although very few women participated these years. There is no women's equivalent on the Olympic programme, as of 2021. The first five events were quite different, with some level of consistency finally beginning with the 1932 event—which, though it had differences from the 1924 competition, was roughly similar. The 1936 competition followed the 1932 one quite closely. The post-
World War II event substantially altered the competition once again. Six of the top 10 shooters from 1964 returned: gold medalist (and 1960 silver medalist and top-five finisher in 1952 and 1956)
Pentti Linnosvuo of Finland, bronze medalist
Lubomír Nácovský of Czechoslovakia, fifth-place finisher (and 1952 silver medalist)
Szilárd Kun of Hungary, sixth-place finisher
Marcel Roșca of Romania, ninth-place finisher
Ladislav Falta of Czechoslovakia, and tenth-place finisher
Tony Clark of Great Britain. The 1960 gold medalist,
William McMillan of the United States, who had finished 12th in 1964, also returned. The 1966 world championship podium (champion
Virgil Atanasiu of Romania, runner-up
Józef Zapędzki of Poland, and third-place finisher
Renart Suleymanov of the Soviet Union) were all competing in Mexico City. El Salvador, Hong Kong, Mongolia, Singapore, and Vietnam each made their debut in the event; East and West Germany competed separately for the first time. The United States made its 11th appearance in the event, most of any nation. Popular pistols were the Swiss Hammerli and the German Walther. ==Competition format==