does anybody know a scrip for a weapon

can anybody give me a script for a weapon of some sort

Here's a script for a weapon:

// Insantiate a rigidbody then set the velocity
var projectile : Rigidbody;
var speed = 50;

function Update () {
    // Ctrl was pressed, launch a projectile
    if (Input.GetButtonDown("Fire1")) {
        // Instantiate the projectile at the position and rotation of this transform
        var clone : Rigidbody;
        clone = Instantiate(projectile, transform.position, transform.rotation);

        // Give the cloned object an initial velocity along the current
        // object's Z axis
        clone.velocity = transform.TransformDirection (Vector3.forward * speed);
    }
}

Put it on your camera. Next, drag the object you wish to use for your bullet onto the empty slot in the inspector. Hope this helps!

Have a go at this: http://unity3d.com/support/resources/tutorials/fpstutorial

If you want to skip reading the tutorial, you can download the completed project files to see how it was made.