Chicken wins in Leesburg?
Not in Leesburg, but I suggest you try Bungalow in Chantilly (intersection of Rts 28 & 50, just east of 28 on the east side of the big shopping center. Sort of across from Taco Bell.
There's a Buffalo Wing Factory chain in the area as well. Decent, but for calling themselves a wing factory it should be better.
Lastly, you should get to know Jimmy's in old town Herndon. Jimmy is from Buffalo. I think the wings are actually one of the weaker things on the menu, but I say that to indicate how good the rest of the menu is. It should be noted that they do a Friday fish fry.