According to an article on Dengekki Hobby Web there's an upcoming Takara Tomy campaign for a TLK Quad Barrell Shotgun. The shotgun seems to be a repaint of one of the gun's of AOE Hound. The gun seems to be from a scene from TLK as noticed by Snaka's blog, but the promotional images show it with Voyager Studio Series Optimus Prime. Starting from April 21st if you purchase more than 4,000 yen (tax included) of Transformers products, you can receive 1 Quad Burrell Shotgun in limited quantity. It will last until stocks are depleted.