Rotating a child weapon of First Person Controller

Hey, so I'm trying to create a weapon that is a child of the First Person Controller. This script works well, but I want the mace to face straight ahead instead of sideways. It fires straight ahead but the object itself is not rotating correctly. I tried changing transform.rotation to Quaternion.identity and Quaternion.Euler but then it spits out in random directions. Help is much appreciated, thanks! I included a screenshot to help too.

 using UnityEngine;
 using System.Collections;
 
 public class WeaponUsage : MonoBehaviour {
     public float lifetime = 2.25f;
     public GameObject maceweapon;
     // Use this for initialization
     void Start () {
     }
     // Update is called once per frame
     void Update () {
         if (Input.GetMouseButtonDown(0)) {
             GameObject go;
             go = Instantiate(maceweapon, transform.position, transform.rotation) as GameObject;
             Destroy(go,lifetime);
             go.transform.parent=transform;
         }
     }
 }