We really like the white background and its good to see how the design would look on black. Our main objection would be the fine shading. We'd like to use stark designs on mugs, shirts, etc. The subtlety of the shading would be lost. I think your use blending of the gun in the letter is very cool.
Just when I thought we had narrowed the field, along you come with some dynamic work. I am impressed with the font and the stylized "G". My job of deciding has just become far more complicated.