Weapons in our film

The killer in our film has to have some sort of weapon otherwise he would have no danger factor associated with him. We are thinking of using props such as a knife or gun. We will most probrable use a bladed weapon because then we could emphasise more on the chase scene. We could also use close-up shots to show the power of the weapon and what it can do. We will obviously use fake weaponry because we don't plan to kill eachother while filming. Props such as these will be a good idea for our film: