Network particle collision

I have a function network game in which i can see other players and all there action etc working just fine. The method we have used for shooting is to turn on a particle emitter. The shooting mechanism works just fine however when the players shoot each other the particles do not collide. I have a world particle collider on it which states to collide with everything. I gues my question is "how do I collide with particles emitting from another player?" If you need any of my scripts for reference please say.

edit The particles are being switched on via RPC on a players local game

I'm assuming because no-one has answered that this is a stupid question. We got it working anyway, turns out that our particles and character controllers were too small. We also added a rigidbody to the players and locked rotation so that it didn't effect the movements we set for it in the script.