Analysis of information sources in references of the Wikipedia article "ISSF Olympic trap" in English language version.
9.4.2.1 a) All types of smoothbore shotguns, including semi-automatics, but excluding pump action shotguns, may be used, provided their caliber does not exceed 12 gauge. Shotguns smaller than 12 gauge may be used.
9.4.2.1 a) All types of smoothbore shotguns, including semi-automatics, but excluding pump action shotguns, may be used, provided their caliber does not exceed 12 gauge. Shotguns smaller than 12 gauge may be used.