This Mossberg 20" All-Purpose barrel features a vent rib, dual bead sights, smoothbore, and blued finish. It includes an Accu-Choke set (Improved Cylinder, Modified, Full) and choke tube wrench. It is compatible with 12 Gauge Mossberg 500 and Maverick 88 6-shot models. Note: Not directly compatible with 500 Cruiser or 500 Chainsaw.