From the looks of the receiver, it appears to be a WASR. Originally imported as a reduced capacity rifle that accepts single stack 10 round mags. They are modified to accept the standard capacity 30 round AK mags and US parts added to insure 922r compliance.
The AK platform is pretty simple. Even the monkeys at Century have a hard time screwing these up. $399 is a very reasonable price, but shoot it immediately to make sure they did not bugger up the mods. If it shoots reliably out of the box, chances are it will give you a lifetime of reliable service.