About Real Shotgun
The Auto Assault-12 (AA-12), originally designed and known as the Atchisson Assault Shotgun, is a shotgun developed in 1972 by Maxwell Atchisson. The most prominent feature is reduced recoil. The current 2005 version has been developed over 18 years since the patent was sold to MPS, Inc. The original design was the basis of several later weapons, including the USAS-12 combat shotgun.

Tokyo Marui AA12 Electric Gun Shotgun
This Marui AA-12 Shotgun is the first Airsoft Automatic Electric Shotgun (AES) in the world.
Semi & Fully Automatic shooting (30 Rounds BB shots per second) Mode,

Polymer Housing & Metal inner frame strong body Construction,
With 90 Rounds Magazine, Each shot can shot out 3 rounds 6mm BB Bullet from 3 barrels,
Each barrel has an individually

adjustable hop up
3 Cylinder Mechabox
so you can control the spread. The internals are some new coating process that