Do you get experience on all of your equipped weapons when you kill enemies, or only on the specific gun being used to kill them with? For example, I'm trying to upgrade a shotgun in slot two, and I have a hand cannon in slot one. If I run out of shotgun ammo and then run around killing enemies with the hand cannon, will that experience I collect contribute to my shotgun's progression as well? Or will it only apply to the hand cannon? Thanks!