So I have 2 players holding a gun with a billboard gui just to make it look cool, but I want it so only the player who owns the gun sees the billboard gui and not able to see others gui is there any way to make this work or am I'm just wasting my time on this and should just to startergui?
You can put the billboard Gui inside of the players PlayerGui, and set it's Adornee to the part you want it on. Then only that player will be able to see the gui.