Without the serial number it is really difficult to tell, and the pictures don't really give you a good view of the shotgun itself. Is it an original green gun with just the RRAD rebuild stamp, is it a blued gun that has been parked, is it a badly worn blued gun with a parked adaptor and guard?? This is one instance where the pictures don't speak a thousand words.

More info is needed to make an accurate judgement, and an educated buying decision.