This new Mossberg 500 Mariner Tactical shotgun fires the 12 gauge shell. It has a 18 1/2" barrel with a marinecote finish for the barrel, shell tube, and receiver. The forearm, pistol grip, and 6 position collapsibel stock are all black synthetic. This pump action shotgun has a side saddle 5 shot shell holder, a forearm "loop", and a 1" thick rubber buttpad. This 5 shot shotgun comes with manual, box, and lock.