You don't need a networkView on the particle emitter, just have one on the player, and have the particle emitter as a child of the player object (so the emitter exists on the player in all network instances of the game), and have a script on the player that sends an RPC to all connected players that he fired a shot.

Here's a basic example:

shotParticles : ParticleEmitter;

function Start(){
    shotParticles.emit = false;
}

function Update(){
    if(Input.GetButtonUp("Fire1")){
        networkView.RPC("EmitShotParticles", RPCMode.All);
    }
}

@RPC
function EmitShotParticles(){
    ShotParticles.emit = true;
}