ATI ATIG410BDB: 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 and 3\" chamber 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. We offer a 10rd magazine that can be purchased HERE.