Each day you get two random issues (one in the morning, one after noon). If one of these issues happens to be about gun ownership, you can choose a decision to act on and it will go into effect at either midnight or at noon (I think Eastern Standard Time), whichever comes first. I don't think it will effect your stats until midnight that day, though.
Edit: Beware, none of the issues necessarily have a reasonable decision. Most of the time you either choose one extreme or another.