Hi yahaV12345,
This is the setup that is used in the default First Person template project. Load that up and look at the ‘FirstPersonCharacter’ blueprint > Event Graph > Spawn projectile section. It is using the location of a ‘Sphere’ component that is placed at the end of the gun as the location to spawn the projectile.
I also added in a Rapid Fire section. 
Cheers,
TJ