singleton.cs

public class WeaponBase : IWeapon
    {
        private static WeaponBase _instance;
        public static WeaponBase Instance()
        {
            var lockObj = new Object();
            if ( _instance == null )
            {
                lock ( lockObj )
                {
                    _instance = _instance ?? new WeaponBase();
                }
            }
            return _instance;
        }

        private WeaponBase()
        {

        }

    }