Orthos Arms Raider S4 12 Gauge Semi-Auto Shotgun - 6+1 Rounds, 18.5" Barrel, 3" Chamber, Adjustable Stock, Synthetic, Camo, Overmolded Grip The Raider S4 shotgun has been years in the making. Our patented SHOCK FORCE recoil system comes standard. This is the best recoil system on the market today and ensures you can even shoot 3" magnum shells in comfort. The shotgun also comes standard with the adjustable cheek pad so you can find the perfect fit. We have partnered with Black River Manufacturing to produce the furniture. Also standard on the shotgun is the enhanced charging handle and bolt release which provides effortless operation. We have also developed our FIBERTRON LED front sight. A small LED provides a subtle glow to the fiber optic front sight which provides unparalleled target acquisition.