Had a good (for me anyway) first day of IB yesterday, got a few wins so I thought I'd specifically try to get special/heavy kills for the weekly bounty. I was trying to get some shotgun kills which I could have just as easily have gotten with my primary, charged into a room, pulled out my shotgun, pulled the trigger...and nothing. Forgot to get more ammo. I wish guns made a more audible click, or something when you try to shoot with no ammo, just so the other person knows what happened and can laugh at the easy kill.