Help! Can't destroy my bullet object because is a rigidbody

Questions & Answers
1 
function Shoot () {

    // Did the time exceed the reload time?
    if (Time.time > reloadTime + lastShot && ammoCount > 0) {
        // create a new projectile, use the same position and rotation as the Launcher.

        var bullet : Rigidbody = Instantiate (bulletPrefabs, spawnBullet.transform.position, Quaternion.LookRotation(inputRotation));

        //Destroy(bullet, 3.0);

        bullet.velocity = tempVector * initialSpeed;
        //bullet.rigidbody.AddForce(transform.right * 2000, ForceMode.Acceleration);
        // Ignore collisions between the missile and the character controller
        Physics.IgnoreCollision(bullet.collider, transform.root.collider);

        lastShot = Time.time;
        ammoCount--;

    }

}
2

It's hard to tell what your question actually is, but I guess you want

Destroy(bullet.gameObject, 3.0);