This over/under shotgun from Tristar is chambered for 20 ga Bore. The CYPHER shotgun features a barrel length of 28" , accepts 3" shells and reflects the quality firearm craftsmanship expected from Tristar. TriStar Cypher Over/Under 20 Gauge 3" 2rd 28" Blued Chrome-Lined, Stainless Steel Rec, Deluxe Walnut Furniture, Fiber Optic Sight, 5 Ext. Chokes.