How is it overpriced? its a full metal gun, cansoft guns go for more sometimes. Cyma has greatly improved over the years.
I wouldn't trust that site, they obviously don't know the laws concerning airsoft and that they will be shut down pretty soon. I also don't like the idea that any kidiot can use mommy's credit card and order from them.
If you speak with them and they do in fact have it in stock then, by all means buy it (if you are 18+ of course) as it is a good deal
as far as specs and compatability go....google?