using System;

using UnityEngine.Events;

public class A

{

    public Action ReloadFinished;

    public void DoSomething()

    {

        if (ReloadFinished != null)

            ReloadFinished.Invoke();    

    }

}

​

public class B

{

    public UnityAction ReloadFinished;

    public void DoSomething()

    {

        if (ReloadFinished != null)

            ReloadFinished.Invoke();    

    }

}

​

public class Program

{

    public static A a = new A();

    public static B b = new B();

    public static void on_ReloadFinished()

    {

        Console.WriteLine("Reload weapon finished was called, do your stuff here ");

    }

    public static void Main()

    {

        a.ReloadFinished += on_ReloadFinished;

        a.DoSomething();

        b.ReloadFinished += on_ReloadFinished;

        b.DoSomething();

    }

}