At my dept, we are allowed to carry our patrol rifle in trunk with mag inserted...since we don't have racks up front. Obviously I don't want my rifle flopping around back there. I'm having trouble finding a rifle bag locally that is wide enough to hold my AR15 with 30 round mag and aimpoint. I don't mind ordering one but would like to know it's going to work first. Do any of you guys have experience with this? What do you use?