bullets wont show up

I made a bullet thing that my gun shoots small cubes and it works normally but when i add my bullet script the cube comes and disappears instantly?

Here is the bullet script:

var maxDist : float = 1000000000;
var decalHitWall : GameObject;
var floatInFrontOfWall : float = 0.00001;

function Update () 
    var hit : RaycastHit;
    if (Physics.Raycast(transform.position, transform.forward, hit, maxDist))
        if (decalHitWall && hit.transform.tag == "Level Parts")
            Instantiate(decalHitWall, hit.point + (hit.normal * floatInFrontOfWall), Quaternion.LookRotation(hit.normal));

You destroy the GameObject on the first frame of update. I assume you want the Destroy call within that if statement?