It is a shell fed pump action shottie

Magazine Capacity: 21 Rounds

Gunsmith Bros Ultra Light Open Slide Kit for Hi-CAPA Black

eliminating the need for an aftermarket barricade stop rail accessory

Lancer Tactical Nylon Strike Tactical Vest Walther Arms It is a shell fedSpecifications Material: 1000D Nylon Exterior w Mesh Inner Lining Size: Medium (Adjustable) One Size Fits Most Color: Black Plate Fit: Up to large (10 x 13 inches) Ballistic Plates Plate Included: Two 9 x 12 inches Dummy Plates (Eva Foam) Features Pals Webbing: Front, back and sides Shoulder Straps: Adjustable w removable padding Waist Strap: Adjustable w velcro flaps Magazine Pouch: Triple molle for M4 M16 dual magazine pouch (Holds 6 mags) & double