Horizontally Flipping Objects

[UNCCheezy]

I am working on a goose model, and I am all done except for the wings. I built one wing, and it looks good, but I'm having a problem. When I try to duplicate it, rotate and move it to the other side, I am unable to get the same wing. I can only get a wing that is wrong. Is there a flip model option that would reverse the model against an axis?

[mayaTitan]

well, if i understood you well, this could help
- Edit -> Duplicate/Instantiate -> Duplicate Symmetry

[UNCCheezy]

Not quite...im basically trying to create a duplicate but reverse it on a single axis.

[AceMastermind]

Select all of the polygons on the wing then right click and select "Symmetrize Polygons" from the context menu.