My cousin is starting to have problems with feral pigs. He would like to get an air powered pellet rifle with enough power to kill the pigs. He says they are small, about 200 lbs. Several factors which are to be considered. He lives between CA and HI and would like to get a pellet rifle which would be TSA approved so he can transport it between his places. Are suppressors available for air rifles? Are they needed or are they quiet enough? He lives in a semi-rural area. Not having any experience with air rifles, I'm turning it over to the experts for suggestions and comments. Thanks.