The 10 meter air pistol is an Olympic shooting event governed by the International Shooting Sport Federation (ISSF). It is similar to 10 meter air rifle in that it is shot with 4.5 mm (or .177) caliber air guns at a distance of 10 metres (11 yards), and that the match consists of a qualification round of 60 competition shots within 75 minutes. If an Electronic Scoring System (EST) is not available, 15 minutes are added to the time limit. Competitors are allowed to shoot an unlimited amount of shots during the 15 minutes preparation and sighting time. Along with the 50 meter pistol, it is considered a precision shooting event. Thus, numerous shooters compete in both events.