Just wondering how to set up a gun that shoots but you cant see the bullets, should I be using raycasts?
That’ll do the trick…unless you have trajectory drop from velocity drag if it is not a sim of an energetic ray type weapon which would shoot in a straight line. You can limit the distance of a raycast which can simulate weapon range.
hth
Great thanks 
You can simulate drop using raycasts too, you just would need more than 1.