Who do you get Infiniti ammo on dead rising

I'm guessing you mean where do you get infinite ammo from in dead rising you have to go to the gun shop in the part of the mall that is under construction (you can get there from outside) then go threw keep to the right then the first hall you see there will be a sign go down the hall and you'll get in the gun shop kill Cletus and you can take guns when ever you want to.