How can you apply force/direction to your fired object without it being a rigidbody/physics object?
Dont think you can unlesss you make some character controller bullet but you can use raycast. or particles. Take a look at the FPS Demo for a good example of raycast and how to apply damage when it hits a object 
Just wondering why you dont want to use a rigidbody :?:
Cheers Ill take a look, reason I don’t want to use Rigidbody is that it really chugs up fps with large scale battle simulations.
If you don’t want it to be handled by physics, then you need to make it kinematic. The whole point of rigidbodies is their physics capabilities. However, if you wish to apply forces to something directly, you need the physics engine which works with rigidbodies.