The Mossberg 590A1 Tactical is the only shotgun to pass MilSpec 3443E a test that required it to fire 3000 consecutive rounds without jamming. This pump-action shotgun features a Parkerized finish (or Marinecote heavy corrosion resistant finish on Marine models) 18.5 or 20 barrel cylinder bore chokes metal trigger guard and safety and drilled and tapped receiver. The optional synthetic Plus 4 Shell Storage Stock stores extra shells within it and ghost ring twin bead and three dot sights are available. Details Gauge 12 - Capacity 9 - Chamber 3 - Barrel Type Heavy-Walled - Barrel Length 20 - Sight Ghost Ring - Choke Cylinder Bore - LOP Type Fixed - LOP 14.25 - Barrel Finish Parkerized - Stock Finish Synthetic (Black) - Weight 7.25 - Length 41