Neat build.
My only observation is, the RARDEN 30mm Barrel is not Silver.
The ONLY part that is Silver is the portion where it goes through the front of the Barrel trough and may touch the dampers within during recoil and runout.
Many references and pictures will guide you as to how far forward and rearward of that point you should paint Silver!
Thank's for sharing and here are a couple of pictures of my 1/35th scale, earlier version.
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Keith.