A total of 390 shooters from 108 countries will participate when the events get under way at the Royal Artillery Barracks in Woolwich.
'It's an extraordinary result, which proves once again the universality of our sport,' said International Shooting Sport Federation secretary general Franz Schreiber.
'Shooting is a sport practised all around the world, and athletes from all the continents have the chance to qualify and compete in the Olympics, in one of our disciplines.
'We are looking forward to great competitions in London.'
Shooting will provide the first medals of the Games, with the women's 10m Air Rifle Final taking place on the morning of 28 July.
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