The patented Tactical DUOSTOCK® is a modification to the stock of a rifle or shotgun for the specific use in Close Quarters Battle (CQB). It consists of an upper and lower surface for the absorption of recoil. The upper surface is the same as any other long weapon. The lower surface is specially angled to ride on the upper chest with the use of body armor. The bottom of the stock is rounded and is held against the chest when in low ready position. This allows for the stock to be smoothly raised, while targeting the threat. This makes for a more stable, consistent shooting platform with the sights and barrel close to the line of sight. This results in increased comfort, speed, and accuracy in any shooting position. I doubt that will ever happen, but if it does, send the pieces back they will replace it free of charge including freight. This is a no questions asked, lifetime guarantee.