Ranged item firing delay

What I'm trying to make is a ranged weapon that doesn't have a draw time like the bow, but instead fires instantly. I haven't been able to find a way to make a delay in between the shots. I can't find a setting for it and messing around in the java code doesn't give me anything either (I'm very inexperienced with java, so I don't know what I was supposed to be looking for. I was just looking for a variable or something). I have a hard time with procedures, so I haven't tried using them yet.