My two favorite systems that are sci-fi with guns and explosions both have fantasy elements, but they should be easy to remove.
Shadowrun 3rd edition ( I just can't see learning 4th, it is too big a change from the past ). You could limit mages and shamans from the game as you wish and stay in mostly human areas to keep the metahumans to a minimum if they turn-off your group.
Rifts. Play a coalition game where the mages are the bad guys and you get to shoot them and blow them up. If they are really sick of magic, hunting mages should be great fun.
Good luck with your game hunting.
Shadowrun 3rd edition ( I just can't see learning 4th, it is too big a change from the past ). You could limit mages and shamans from the game as you wish and stay in mostly human areas to keep the metahumans to a minimum if they turn-off your group.
Rifts. Play a coalition game where the mages are the bad guys and you get to shoot them and blow them up. If they are really sick of magic, hunting mages should be great fun.
Good luck with your game hunting.