Cant get OnParticleCollison to trigger (Bug?)

Hi guys,

I have done some searching and I'm not able to find my issue solveable.

I have a BulletParticle object, which shoots particles from a Bullet Spawn Point object which is nested inside my players weapon.

I have the particle system setup on the bullet, collision is enabled and Send Collison Messages is checked. I have run checks on my particle emitter, which is working fine. I am unable to get a trigger on OnParticleCollison();

In this case, I am trying to shoot the gun which emits purple particles and have it move a cube.

BulletParticle Inspector

• Particle System (Renderer is set to StretchedBillBoard, collison is enabled with world! - collides with everthing)

• Particle Direction script (Weapon is set to bullet spawn point)

• No collider

Cube Inspector - Box Collider (Is Trigger is not set) - Mesh Renderer - Rigid Body

Here is my code as well.

 using UnityEngine;
 using System.Collections;
 
 public class ParticleDirection : MonoBehaviour {
 
     public Transform weapon;
 
 
     // Update is called once per frame
     void Update () {
         transform.position = weapon.TransformPoint(Vector3.zero); 
         transform.forward = weapon.TransformDirection (Vector3.forward);
     }
 
     void OnParticleCollison(GameObject other) 
     {
         Debug.LogError("Particle collison");
 
         Rigidbody body = other.GetComponent<Rigidbody>();
         if (body) {        
             Debug.Log("Collison", gameObject);
             Vector3 direction = other.transform.position - transform.position;
             direction = direction.normalized;
             body.AddForce (direction * 5000);
         }
 
     }
 
 }
 

Included Images/Video http://imgur.com/a/gvpeo