This steel SKS shell deflector is compatible with SKS and AK rifles, it fits over the rear sight. Shell deflector protects scope and optics from being struck by extracted brass shell casings. You can still mount a full size rifle scope or compact scope on your rifle and not have to worry about ejecting shells dinging up your scope or knocking it off zero. This Shell Deflector Will fit any SKS rifle or carbine, Will fit any AK-47 type rifle or carbine, Will also fit other rifles with similar type Military rear sight. Easy installation requires no gunsmiting or alteration to your rifle. This is a must have item for anyone that plans to use a scope on their rifle. Limited lifetime warranty.