The all-new SDX12 combines the modularity of the AR platform, the ability to shoot slugs or shot, and a smart gas system that can handle 3" and 2 3/4" shells to create the most versatile AR-style Shotgun we've ever seen. It's built around a detachable alloy upper receiver and advanced polymer lower receiver, and features a nice ThermoDefend forend that sports a full-length Picatinny rail on the bottom along with shorter rails on the top and sides. The SDX12 comes with an 18" barrel that can handle shot or slugs without issue. It comes with 3 chokes (cylinder bore choke brake, full, and improved cylinder), and accepts Remchokes. - CHAMBER 12GA 3" - MAGAZINE (1) 2rd and (2) 5rd capacity - CHOKES F, IC, CYL - SIGHTS Adjustable carry-handle rear sight & fixed front sight, Adjustable flip-up rear and front sight set also included - STOCK SDX12 comes with 3 magazines and (1) 2-round mag that nestles within the stock for added firepower