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I don’t think you understand green-screen/chroma-key. The idea is that you use a green (or sometimes blue) background with your subject in front of the green backdrop. You then use your editing software to make the green screen disappear — “key” it out — so that the figure in the foreground is in limbo, without anything behind him/her. Then, again using your editing software, you supply an appropriate background.
If you want a prop that has the texture of a gun you’re going to have to paint it realistically. Or better still, purchase a real looking plastic gun.