Sized for youngsters and small-frame adults, the Mossberg 500 Bantam Field/Deer 20 Gauge Pump-Action Shotgun comes with interchangeable barrels and a wood stock. The 22-inch blued, vent-rib barrel has a dual-bead sight, and the 24-inch blued, ported Slugster barrel boasts a fully rifled bore. Mossberg 500 Bantam Field/Deer 20 Gauge Pump-Action Shotgun - Shotgun Manual at Academy Sports