hoss is right on about this one. If you were going to blast a few rabbits every year, I'd say go for a cheap over and under, but not on a trap or skeet range. I've personally seen several of the cheap Russian over and unders die on skeet and trap ranges. They won't hold up to the pounding these guns take.

As a side not, I avoid used trap and skeet guns like the plague. They can look lightly used on the outside, but have thousand of rounds through them. I saw my dad wear a Beretta skeet gun out out internally, but from the outside it would have passed for lightly used.