ORTHOS Raider S4 Tactical 12 Gauge 3" 18.5" Barrel 6+1 Semi-Auto Shotgun - M-LOK | FDE The Raider S4 shotgun sports our patented SHOCK FORCE recoil system with the adjustable cheek pad so you can find the perfect fit, 40" long with collapsed stock. We have partnered with Black River Manufacturing to produce the furniture. Standard on the shotgun is the oversized charging handle and bolt release; angled three piece Modular Vertical Grip With M-LOK Rail grips; front and rear sling mounts; Ghost Ring sight with our patented FIBERTRON LED Fiber Optic Light Up front Sight; oversized safety switch; large enhanced lever bolt switch; advanced trigger; Spring Assist Ejector. Includes 6+1 magazine tube, Breacher choke tube, FIBERTRON LED Fiber Optic Light Up front Sight, adjustable stock w/SHOCK FORCE Recoil System and owners manual.