ControllerManager.cs

using UnityEngine;
using System.Collections;

public class ControllerManager : MonoBehaviour {

    public Rigidbody BulletPrefab;
    public Transform BarrelEnd;
    public float MyForce;
    public float timer;
    public GameObject PlayerBullet;
    Animation otherAnimator;

    private Valve.VR.EVRButtonId triggerButton = Valve.VR.EVRButtonId.k_EButton_SteamVR_Trigger;
    private SteamVR_TrackedObject trackedObject;
    private SteamVR_Controller.Device device;

    void Start () {
        trackedObject = GetComponent<SteamVR_TrackedObject> ();
        timer = 0;
    }

    void Update () {
        timer += Time.deltaTime;

        device = SteamVR_Controller.Input ((int)trackedObject.index);
        if(device.GetPressDown(triggerButton))
        {
            if (timer > 2.0f) {
                device.TriggerHapticPulse (700);
                otherAnimator = PlayerBullet.GetComponent<Animation> ();
                Rigidbody bulletInstance;
                bulletInstance = Instantiate (BulletPrefab, BarrelEnd.position, BarrelEnd.rotation) as Rigidbody;
                bulletInstance.AddForce (BarrelEnd.forward * MyForce);
                timer = 0;
            }
        }
    }
}