Green Mountain Grills Wood-Fired Pizza Attachment for Peak/Ledge & Jim Bowie/Daniel Boone Grills - GMG-4023. GMG-4023. Pizza Oven Boxes & Kits. Convert your GMG pellet grill into a wood-wired gourmet pizza oven. The pizza oven attachment captures and funnels the heat from the firebox directly up and into the steel baking chamber encasing the pizza stone. This process raises the internal temperature of your pellet grill to that of a real wood burning pizza oven. It creates temperatures upwards of 800 degree Fahrenheit, allowing you to cook restaurant quality pizza in 2-4 minutes. It is also useful for baking bread at 400-600 degrees Fahrenheit and searing steaks at 900 degrees Fahrenheit. This attachment fits Peak, Ledge, Jim Bowie, and Daniel Boone grills....