Instantiates and launches the projectile forward

Projectile Shooter C#

public class ProjectileShooter : MonoBehaviour {
	public float speed = 200f;
	public GameObject prefab;

	public void Shoot()
	{
		GameObject projectile = Instantiate (prefab,transform.position,Quaternion.identity ) as GameObject;
		projectile.transform.eulerAngles = transform.eulerAngles;
		Rigidbody rb = projectile.GetComponent<Rigidbody>();
		rb.velocity = transform.forward * speed;
	}
}