Century Arms SG4979-N: The Centurion Optio-I is what a fantastic semi-auto shotgun should be. Reliable and fun to shoot. The best part? This offering from Century does it all without breaking the bank. This unique shotgun features a monolithic polymer lower with an integrated shell holder in the stock. The controls on this shotgun are much like an AR minus the charging handle, which is located on the right side. Even the handguard is reminiscent of the classic M16 style handguards, with the exception of two Picatinny rails ready for your favorite tactical accessories.