Received the following from Ted Brindle (iflyrc5@comcast.net)
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Note that Horizon has come out with a bulletin on the Extra 300.  It looks like they had a production problem in making the wings and many of them have a flat section on the top on the outer portion - they won't admit this is an issue and are telling folks to move the CG forward.  There is a lot of messages on the various forums about this - some folks are actually inverting their wings and find it flys much better but looks strange.  I would be interested to know what the folks that purchase these from you have to say about the wing on their planes having the flat area - mine does have the flat area.

http://www.horizonhobby.com/Products/Default.aspx?ProdID=PKZ5180#quickSupport