Mossberg 590R, Pump Action Shotgun, 12 Gauge, 3 Chamber, 18.5 Barrel with Stand-Off, Matte Finish, Black, Collapsible Stock, Heat Shield, Top Picatinny Rail, 6 Round 50761 The 590R Rotary Safety Selector shotguns combine time-tested pump-action performance with ground-breaking features like a rotary safety selector, an ergonomically-designed forend, and an integrated barrel/heat shield combination.