Wisconsin Statutes Police Regulations (Ch. 163 to 177) § 167.30. Use of firearms, etc., near park, etc

(1) Any person who shall discharge or cause the discharge of any missile from any firearm, slung shot, bow and arrow or other weapon, within 40 rods of any public park, square or enclosure owned or controlled by any municipality within this state and resorted to for recreation or pleasure, when such park, square or enclosure is wholly situated without the limits of such municipality, shall be punished by imprisonment in the county jail not exceeding 60 days or by fine of not more than $25 nor less than one dollar.

(2) Subsection (1) does not apply to the discharge of a firearm if the actor's conduct is justified or, had it been subject to a criminal penalty, would have been subject to a defense described in s. 939.45.