ATI ATIG20BDB: The Bull-Dog semi-automatic shotgun features a new age look and modular design which makes it a perfect fit for all types of gun owners. From the quick acquisition flip up sights, 3\" chamber and 3-piece choke tube set for our avid shot gun users, to the AR style charging handle, picatinny and M-Lok rails for tactical gun users. Also featuring an adjustable cheek rest and a picatinny cut out at the base of the magazine, this allows you to slide your spare full or empty magazine onto the bottom picatinny rail and use the magazine as a fore grip. With an easy access quick release button to change mags fast and efficiently.