Winchester designed the model SX3 Waterfowl Semi-Auto Shotgun specifically for hardcore duck and goose hunting. The SX3 uses Winchester's Active Valve System that automatically self-adjusts, allocating the exact gas pressure necessary to fire a wide range of hunting loads. When the SX3 Waterfowl fires heavy magnum loads, gases vent upward and out of the Quadra-Vent ports in the forearm, further regulating bolt speed. The SX3 Hybrid Waterfowl comes with a synthetic stock and forearm with spacers and shims to adjust for length of pull, cast, and drop at comb. An Inflex Technology recoil pad reduces felt recoil. A hard heel insert on the pad makes mounting the shotgun snag free. Invector-Plus interchangeable choke tube system works hand-in-hand with the back-bored barrel to reduce shot deformation and promote the uniform shot patterns you need to wallop birds at long range. Chrome-plated chamber and bore. Reversible crossbolt safety button. Trigger group easily drops out for field cleaning. Sling swivel studs. Includes 3 chokes: F, M, IC.