3 inches chamber over and under. The Sporting O/U features a solid frame for durability and strength, sealed actions to keep dirt out, self-adjusting locking lugs, top tang barrel selector and safety, and steel mono-block barrel construction, Turkish Walnut with semi-gloss finish and ported barrels. Comes with 5 extended interchangeable Beretta/Benelli mobil style choke tubes (SK, IC, M, IM, F), choke box and choke wrench. rubber recoil pad and backed with a 5 years mechanical warranty. The primary safety is located on the top tang. When engaged, the safety is designed to block the trigger, hammer lever and the hammer which makes the firing mechanism immobile. The safety slides forward and backward (back is safe). When the safety is engaged, the shooter may move it left or right to select which barrel will fire first. Placing the safety switch to the right will fire the top barrel first, to the left will fire the bottom barrel first. Features: Ejectors Wide target rib Fiber optic sight and brass mid bead Chrome line chamber and barrel Vent top and mid rib Ported barrels Turkish walnut stock and forearm (5) Beretta/Benelli mobil style choke tubes (IC, M, F, extended skeet)