Dealer friend of mine said this is a 1 owner rifle bought new in 79 and its the first one he has had in his shop since he's been in business (25yrs)I would rate it to be about 85-90% no dings,scratches and no wear to the blueing,it's chambered in 308win. Is the 600 with vent rib more or less than the mohawk? I just don't know what they are going for and don't want to give no low-ball offer. Thanks