Create a boomerang effect once the weapon has already fired

I have the weapon shooting but I can’t get it to come back. I want the target to be my FP Character. It just goes in a straight line. I am not sure why when I have that box checked why it won’t come back to me. I have tried multiple things with gravity and speed. I tried some tutorials to which none worked because I was trying to make it return to orginial position.
If anyone can help it would be greatly appreciated.