Wettie Kids Butterfish Banger SpeargunPerfect entry level gun for the junior spearo. With the right gun safety lessons taught by a supervising adult, we dont think there needs to be an age restriction for children using a speargun. Suitable for even small children having the option of 2x 10mm rubbers or long 14mm rubbers, making it very easy to load before their muscles grow! The muzzle also allows for you to upgrade to a thicker or shorter rubber as they get stronger. Band Set up