When hanging out with for example Trevor he always uses the combat MG. Is there a way to have him use a different weapon? No matter what I equip as Michael, Trevor always uses the combat MG.
He'll use the strongest gun he's got in his weapon wheel. You have to get busted while holding the combat MG to lose it. Then he will use the regular MG, and then the Gusenberg, which you cannot get rid of. I haven't checked to see if he'll use it with no ammo though, so you might wanna try that.