The S4 has a small black ring on the bottom of the plane.

Both my S1 & S2 ver. are missing it. Are they all supposed to have it?
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Also the think the graphics are messed up on the bottom right wing of the same plane.

Finally, after finding theses problems, I was looking on the 21c website, and noticed that none of my FW-190's have anything sticking out of the far right front wing, as illustrated on 21c's site.

Any help would be appreciated.