Antonio,
Guns were never marked in any way to indicate a re bluing. The best evidence on your gun, for example, is to look at the "scalloped out" area of your upper receiver just to the left and above the C/N. This is where the upper receiver is contoured down near where it meets the barrel. This area should be a very sharp, crisp machining cut with wear only on the sharp edges on a 90% plus gun. Yours shows evidence of having been buffed down and the edges rounded in this area prior to re bluing..
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