Shooting events in Olympics are subjected to the rules and regulations of International Shooting Sport Federation (ISSF).
Round targets are used for rifle and pistol events. Target consists of concentric circles. The smallest circle in the center is called bull’s-eye and gives you maximum points. The size of the target is different for different events.
The task for shotgun event is to shoot down the clay targets thrown into the air. The contestant who breaks the maximum number of target is declared winner.
Only one shot per target is allowed in double trap and skeet.
Two shots each are allowed in trap event.
4.5mm (.177 inch) pellets can be used in pistols and the gun should be loaded only with one pellet.
Semi-automatic pistols or revolvers should be used in rapid-fire pistol event. Compensators or perforated barrel attachments are allowed.
Only 22-caliber rimfire single-shot pistols are allowed for pistol events.
Action 22-caliber rimfire rifle can be used in the "rifle 3 positions" event and in prone. Thumbholes, palm rests, thumb rests, heel rests, and spirit levels are allowed.
Smooth-bore shotgun 12 gauge or smaller is allowed for shotgun events including double trap, trap, and skeet. However, slings are not allowed.