Several M240B-Tesla Gold skins

I currently played with 3 M240B-Tesla Gold, i picked them up in random games, all of them had different skins. How is that possible ? Can i change the skin of this MG ? I can proof 2 different skins, but i have problems to upload the images.

Most of you probaly know the silvery and metallic skin, but i also played with one, which basically had the skin of the normal M240B-Tesla, but only fully covered in gold, it was also bulkier.

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