That is much lower than I would have imagined, unless these are in bad condition. M-1s in good shape going for much more. (I am assuming this is a semi-auto or military conversion from selective fire to semi-auto).500 give or take
If it has the flash suppressor or one of the fake flash suppressors (without the slots cut out), it will likely be a Chinese gun. The Chinese guns are a great value for the money. My Poly Tech runs like a clock and has many thousands of rounds thru it.There are a couple different types of Century marked M14's.
Some were complete Chinese made rifles (Polytech and Norinco) that were just marked Century. In that case they have excellent forged receivers. The Chinese rifles are bringing $800 and up now, and many are just being used for the receivers and upgraded with USGI parts.
Century also made up rifles using US made commercial Federal Ordnance receivers, which are cast and not near the quality of the Chinese receivers. The value would depend on the other parts on the rifle, more if they are USGI, less if Chinese. A Federal Ordnance receiver with Chinese parts would be the lowest value, but would still bring $600 to $700 pretty quick.
Yeah, Clint does have a bit of a bias. I'm going by what several top M14 smiths are saying on the M14 Forums. They are building several thousand dollar match rifles on Chinese forged receivers because they are better than most US made receivers.