This is a standard Benelli M2 with an RCI XRAIL system installed adding three additional rotating magazine tubes bringing the total capacity to 25 rounds. Originally designed for 3-Gun shooting before the proliferation of magazine fed shotguns, this is a very cool piece of shooting history. The gun itself has a 3 inch chamber and interchangeable choke tubes (improved cylinder installed). Included with the gun is a Pelican case, spare parts, and six extra chokes (five 12 Ga. and one undersized). Length of pull is 14 1/4 inches.