2.5D Shooting Rigidbodies vs RayCasts

Hello everybody. I have this problem. Im designing some 2.5D co-Op shooter. You always fire in straight line, so the bullets will follow the trajectory the player is facing at the time of the Fire input. but i dont know how to make the bullets. Because, making them Rigidbodies unnafected by gravity, in the network implementation ill have to instantiate one bullet in each of the games. And if i do it by raycasting, i wont be able to see the bullet, and that's something i want. Something has any advice on how to do this?