This sounds like a deceptive title. They are offering rewards for stuff that leads to an arrest, not just info that someone has a gun.
There is a line in my area you can call to report crimes and they will possibly give a reward out. Same as with this though, it has to lead to an arrest and, I think, a conviction. So its more along the lines of encouraging people to turn lawbreakers in rather than them just give out money for info. Of course I suppose we are all lawbreakers here. haha
To climb the mountain, you must believe you can.