them from licensed dealers. Laws may also prohibit the use of powerheads in sport fishing. They are allowed in US federally controlled waters, but many states prohibit their use in state controlled waters. One can be easily in violation of state law despite being compliant with federal regulations. References External links Wally Gibbins with an eleven-foot tiger shark and 10 gauge shotgun powerhead in 1963. Archived from the original on 2016-07-27. Firearm terminology Underwater firearms