Stevens 560 Field, Semi-automatic Shotgun, 12 Gauge, 3 Chamber, 26 Vent Rib Barrel, Walnut Stock, 5 Rounds, Includes 3 Chokes - Improved Cylinder, Improved Modified and Full 57964 The Steven's 560 Field is a 3" chambered Gas Operated Shotgun. This gun features a Turkish Walnut stock and fore-end along with a raised vented rib with both a mid-bead sight and fiber optic front sight. The 560 Field has a lightweight Aluminum Alloy receiver and hard chrome lined barrel. Each model features a manual safety design with over-sized controls and comes with a three choke (IC, IM, F) system.