Iron Man Action Figure Backpack Add-On/Accessory (Cannon)

30cm Iron Man Action Figure Accessory (Cannon) (see link below). This accessory attaches to a proprietary port on the back of the figure. Shape of the port in the attached photo.

Fits to Spider-Man too! Added spiderweb that can be shaped to convex shape by heating the material (in my case with gas oven).

Amazon.com: Avengers Marvel Titan Hero Series Collectible 12-Inch Iron Man Action Figure, Toy for Ages 4 and Up : Toys & Games