ShooterScript.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ShooterScript : MonoBehaviour {

	public Transform bulletTransform;
	public Rigidbody bulletTemplate;
	public float bulletSpeedX = -1000.0f;


	// Use this for initialization
	void Start () {
		InvokeRepeating ("GenerateBullet", 0, 1);
	}
	
	// Update is called once per frame
	void Update () {
	}

	void GenerateBullet() {
		Quaternion rot = transform.rotation;
		Rigidbody generatedBall = (Rigidbody)Instantiate (bulletTemplate, bulletTransform, rot);
		generatedBall.AddForce (new Vector3 (bulletSpeedX, 0, 0));

	}
}