A unique design
Marui has considered all mechanic aspects of an innovating engineering to achieve the desired performance. Indeed, the AA-12 has three different barrels, each one with its own hop-up.
Same as many shotgun we can find in the market, this one has 3 barrels, so we can shoot 3 balls at once.
In order to control electronically shotting sequence, Tokyo Marui has integrated a FET system.