Making bullet holes in enemies.

Hi! I am making an fps based on the fps tutorial. I have a raycast machine gun and a enemy robot. The enemy robot looks like this:

As you can see, the robot has armor and some exposed skin. Is there a way to make bullet holes on the armor and blood spurts on the skin?

Damage receiver:

 var hitPoints = 100.0;
 var deadReplacement : Transform;
 var dieSound : AudioClip;
 
 function ApplyDamage (damage : float) {
     // We already have less than 0 hitpoints, maybe we got killed already?
     if (hitPoints <= 0.0)
         return;
 
     hitPoints -= damage;
     if (hitPoints <= 0.0)
     {
         Detonate();
     }
 }
 
 function Detonate () {
     // Destroy ourselves
     Destroy(gameObject);
     
     // Play a dying audio clip
     if (dieSound)
         AudioSource.PlayClipAtPoint(dieSound, transform.position);
 
     // Replace ourselves with the dead body
     if (deadReplacement) {
         var dead : Transform = Instantiate(deadReplacement, transform.position, transform.rotation);
         
         // Copy position & rotation from the old hierarchy into the dead replacement
         CopyTransformsRecurse(transform, dead);
     }
 }
 
 static function CopyTransformsRecurse (src : Transform,  dst : Transform) {
     dst.position = src.position;
     dst.rotation = src.rotation;
     
     for (var child : Transform in dst) {
         // Match the transform with the same name
         var curSrc = src.Find(child.name);
         if (curSrc)
             CopyTransformsRecurse(curSrc, child);
     }
 }

Machine Gun script:

 var playerWeapons : GameObject;
 var range = 100.0;
 var fireRate = 0.005;
 var force = 5.0;
 var damage = 0.5;
 var bulletsPerClip = 1000;
 var clips = 5;
 var reloadTime = 1;
 private var hitParticles : ParticleEmitter;
 var muzzleFlash : Renderer;
 var reload : AudioClip;
 private var bulletsLeft : int = 0;
 private var nextFireTime = 0.0;
 private var m_LastFrameShot = -1;
 
 function Start () {
     hitParticles = GetComponentInChildren(ParticleEmitter);
     
     // We don't want to emit particles all the time, only when we hit something.
     if (hitParticles)
         hitParticles.emit = false;
     bulletsLeft = bulletsPerClip;
 }
 
 function LateUpdate() {
     if (muzzleFlash) {
         // We shot this frame, enable the muzzle flash
         if (m_LastFrameShot == Time.frameCount) {
             muzzleFlash.transform.localRotation = Quaternion.AngleAxis(Random.value * 360, Vector3.forward);
             muzzleFlash.enabled = true;
 
             if (audio) {
                 if (!audio.isPlaying)
                     audio.Play();
                 audio.loop = true;
             }
         } else {
         // We didn't, disable the muzzle flash
             muzzleFlash.enabled = false;
             enabled = false;
             
             // Play sound
             if (audio)
             {
                 audio.loop = false;
             }
         }
     }
 }
 
 function Fire () {
     
 
     if (bulletsLeft == 0)
         return;
     
     // If there is more than one bullet between the last and this frame
     // Reset the nextFireTime
     if (Time.time - fireRate > nextFireTime)
         nextFireTime = Time.time - Time.deltaTime;
     
     // Keep firing until we used up the fire time
     while( nextFireTime < Time.time && bulletsLeft != 0) {
         FireOneShot();
         nextFireTime += fireRate;
     }
 }
 
 function FireOneShot () {
     var direction = transform.TransformDirection(Vector3.forward);
     var hit : RaycastHit;
     
     // Did we hit anything?
     if (Physics.Raycast (transform.position, direction, hit, range)) {
         // Apply a force to the rigidbody we hit
         if (hit.rigidbody)
             hit.rigidbody.AddForceAtPosition(force * direction, hit.point);
         
         // Place the particle system for spawing out of place where we hit the surface!
         // And spawn a couple of particles
         if (hitParticles) {
             hitParticles.transform.position = hit.point;
             hitParticles.transform.rotation = Quaternion.FromToRotation(Vector3.up, hit.normal);
             hitParticles.Emit();
         }
 
         // Send a damage message to the hit object            
         hit.collider.SendMessageUpwards("ApplyDamage", damage, SendMessageOptions.DontRequireReceiver);
     }
     
     bulletsLeft--;
 
     // Register that we shot this frame,
     // so that the LateUpdate function enabled the muzzleflash renderer for one frame
     m_LastFrameShot = Time.frameCount;
     enabled = true;
     
     // Reload gun in reload Time        
     if (bulletsLeft == 0)
         Reload();            
 }
 
 function Reload () {
     
         
     playerWeapons.GetComponent(PlayerWeapons).enabled = false;
     // Wait for reload time first - then add more bullets!
     yield WaitForSeconds(reloadTime);
     playerWeapons.GetComponent(PlayerWeapons).enabled = true;
 
     // We have a clip left reload
     if (clips > 0) {
         clips--;
         bulletsLeft = bulletsPerClip;
         audio.PlayOneShot(reload, 1.0 / audio.volume);
 
     }
     
 
 }
 
 function GetBulletsLeft () {
     return bulletsLeft;
 }