It's all steel. Made out of 16 ga. It's hollow with slot and tabbed ribs. Plug welded and ground. Like the Springfield M6, it has on board ammo storage in the stock. 11 .410 rounds. It is a little heavy, weighing in at around 8lbs. I keep it in my vehicle, broke down. Also like the original, there is a single pin that seperates the barrel completely or simply unlock the breech lock and fold it in two.