A Bass Pro Shops Exclusive! The Winchester SX4 Waterfowl Hunter Semi-Auto Shotgun has improved ergonomics over the previous SX3 model, being slimmer and lighter with a slightly forward balance point for fluid swinging and follow-through. The SX4 uses Winchester's Active Valve System that automatically self-adjusts, allocating the exact gas pressure necessary to fire hunting loads. Gases vent upward and out of the Quadra-Vent ports in the forearm, further regulating bolt speed and providing unflinching reliability and recoil control even in extreme weather. Larger redesigned operating controls (safety, bolt handle, and bolt release) and a larger trigger guard provide easy handling in cold weather and while wearing gloves. The SX4 Waterfowl Hunter Shotgun also uses the proven Invector-Plus interchangeable choke tube system that works hand in hand with the back-bored barrel to reduce shot deformation and promote tighter patterns. A TRUGLO fiber-optic front sight provides fast targeting. Reversible cross-bolt safety. Includes 3 choke tubes (F, M, IC). Slimmer and lighter with improved ergonomics Larger operating controls Self-adjusting Active Valve System TRUGLO fiber-optic front sight Inflex recoil pad Includes 3 Invector-Plus choke tubes (F, M, IC)