I think bullets come out now.

[rbdr/super-polarity] / Super Polarity / Actors / Bullet.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace SuperPolarity
{
    class Bullet : Actor
    {
        protected ParticleEngine particleEngine;

        public Bullet(Game newGame)
            : base(newGame)
        {
        }

        ~Bullet()
        {
            particleEngine = null;
        }

        public override void Initialize(Texture2D texture, Vector2 position)
        {
            base.Initialize(texture, position);
            particleEngine = ParticleEffectFactory.CreateBullet(position);
        }

        public override void Update(GameTime gameTime)
        {
            Velocity.X = (float)(MaxVelocity * Math.Cos(Angle));
            Velocity.Y = (float)(MaxVelocity * Math.Sin(Angle));

            Position += Velocity;

            particleEngine.Update();
            particleEngine.EmitterLocation = Position;
        }

        public override void Draw(SpriteBatch spriteBatch)
        {
            base.Draw(spriteBatch);
            particleEngine.Draw(spriteBatch);
        }
    }
}