This Black River Manufacturing Stock and Forend Set comes with the patented SHOCK FORCE recoil system. This set comes standard with RED stiff springs which are perfect for your 3 1/2" shells and under. The SHOCK FORCE system allows you to finally shoot inertia guns in comfort. This set also comes with mid and flush mount cheek pads so you can customize it for the perfect fit. Two preimum sling mounts also come standard. IncludedStockSHOCK FORCE Recoil PadFlush Mount Cheek PadMid Cheek Pad2 Sling SwivelsMounting HardwareShims