To be honest it'd probably be better to take the AA gun skin and make it match the Bungie one; that way you'll also get an idea of how to better replicate thier materials. That edit to make it "AA"-ish is pretty lackluster though (the redish-gray on the unarmored sections look pretty tacky), if anything I'd improve that instead of making an entirely new skin for the tank.
And I don't think re-unwrapping the Bungie wraith will do you much good, as it's pretty well-done and packed as it is.
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