looks to be classic valve, rail and body. benchmark single trigger frame, with benchmark drop and tank craddle. Air america tank and reg. value about 100 bucks give or take. would like a closer look at that barrel.
Nice clean looking Classic. His ad says its "fully automatic", not sure what to think about that. It does say that it comes with 3 extra barrels so there could be value there. I'd pay what hes asking if the Mag operates correctly and the barrels are nice. Its a good price. He isn't very bright, calling the marker a "Pro line" so I'd use caution. He obviously doesn't know Mags which means there is a good chance it has been abused and denied proper maintenance.