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.Choke Configuration: Accu-ChokeCaliber Or Gauge: 12 GaugeLength: 20"Model: All PurposeSights: Dual BeadBore Type: SmoothFinish: BluedType: SecurityChokes Included: F,M,ICBarrel Type: All PurposeBarrel Features: Vent Rib