PC Gal Gun: Double Peace coming to PC via Steam on September 27 PlayStation rail shooter makes the jump to PC. Gal Gun: Double Peace is coming to PC via Steam on September 27, publisher PQube announced. The Steam version will include Steam trading cards.Gal Gun: Double Peace first launched for PlayStation 4 and PS Vita earlier this summer. Read more about the rail shooter here. Watch the Steam announcement trailer below. Thanks, Rice Digital.