Abstract: An improvement in a launcher for launching spheroid pigs one at a time into a pipeline, having a downward sloping barrel magazine for holding a multiplicity of spheroid pigs and having a closable fluid tight opening for loading the pigs on the breech end and a full bore opening valve on the muzzle end in fluid communication with a pipeline, is characterized by apparatus situated in the barrel magazine upstream of the full bore valve for releasing the pigs one at a time into the pipeline from the magazine.