Mossberg 590S, Shockwave, Pump Action, 12 Gauge, 3 Chamber, 14.375 Barrel, Matte Blued Finish, Shockwave Grip, Bead Sight, 8 Rounds, Cycles 1.75, 2.75, or 3 Shells 51601 For the ultimate in shooting exibility, the all-new 590S Series cycles 1.75 in., 2.75 in., or 3 in. shells. Pick one shotshell length for special shooting needs, or simultaneously load any combination of those shell lengths. The choice is yours with the 590S. Dual extractors, twin action bars, positive steel-to-steel lockup, and an anti-jam elevator provide smooth operation. Other features include a top-mounted ambidextrous safety, magazine clean-out tube with cap, and a logo-engraved receiver on all models.