Weapons Sniper Scope

hi, i'm still working on weapons features, this time i added sniper scope with nice radial blur effect.
to create this radial effect i needed to add few features to material system so i could define which shader to use in which stage and which shader parameters and samplers i need to bind when binding this shader.
i also add the option to use current back buffer image as one of the samplers i'm binding to the shader, so i could create post process effects.
the effect i chosed is radial blur so everything outside our zoom area will be blurred and stretched.
i also change aim accuracy based on zoom, the more we zoom in the more we get accurate.
here is screenshots of the effect.