This setup will work for any bullet. Try not to confuse how something looks with how it functions. The trace is essentially your bullet. You can absolutely change the cosmetics to have it look how you want. You don’t need to make a bullet mesh.
If you’re thinking rapid fire - just fire off the function once for each shot. This is substantially less overhead than trying to process a hundred and one meshes whizzing about. 
Have a look at the documentation for beam particles - it will definitely do what you want to achieve.