That saw has been beat up. as Crusherclaw said, "That 046 has seen some serious use , unless you are mechanical it could be a head ache. I'd take the 600.00 you were gonna spend on the 391 and post a want ad on this site and see what it turns up."Photos of the 046
May I add that even if you are mechanical, it will be a head ache. There are 046s out there for the same price and in better condition.