RROR - An object reference is required to access non-static member, how do i fix?

Ive seen several of these posts yet i cant understand what to do and also i get "playerweapon dosent contain a constructor that takes 5 arguments".

using UnityEngine;

[System.Serializable]

//public class PlayerWeapon {

// public string name = "Blaster";

// public int damage = 10; // public float range = 100f;

// public float fireRate = 0f;

// public GameObject graphics; //}

public class PlayerWeapon { // Field public string name; public int damage; public float range; public float fireRate; public static GameObject graphics;

 // Constructor that takes no arguments.
 public PlayerWeapon()
 {
     name = "Blaster";
     damage = 10;
     range = 100f;
     fireRate = 0f;
     GameObject graphics;
 }


 // Constructor that takes one argument.
 public PlayerWeapon(string _name, int _dmg, float _range, float _fireRate, GameObject _graphics)   //GameObject _graphics
 {
     name = _name;
     damage = _dmg;
     range = _range;
     fireRate = _fireRate;
     graphics = _graphics;
 }


 class Weapon
 {
     public static  void Main(string[] args)
     {
         Weapon Rifle = new Weapon("Rifle", 20, 200f, 0f, Riflegraphs);
     }

 }

}