The Mossberg 510 Mini Super Bantam 20 Gauge Pump Action Shotgun is pump action and has a 3-round capacity. It's built with a vent rib barrel, stainless steel receiver and a synthetic stock. Dual bead sights and a tang safety complete the design. Mossberg 510 Mini Super Bantam 20 Gauge Pump Action Shotgun - Shotgun Manual at Academy Sports