Winchester's SX4 Semi-Automatic Shotgun has an alloy magazine tube and recoil spring system reduce weight by 0.5 lb.a Back-Bored technology provides optimum shot patterns. Hard chrome-plated chamber resistant to weather. Self-adjusting Active Valve system ensures speed, recoil reduction and durability. Inflex Technology pad reduces recoil Quadra-Vent Ports vent excess gases for cleaner operation. Larger bolt handle and bolt-release button are faster operate. Lightweight aluminum-alloy receiver. Ambidextrous Crossbolt Safety is easily reversible.