Let me put it this way, if you put up an ad on this board selling that for $400 you'd get an "I'll take it" within 10 minutes and about a 20 person deep line of people on a waiting list. That would be a fair price for a mismatched gun with no sling. Add $100 for the sling. Add another $100+ for matching, add more for the condition. I concur $600 would be a bargain, to someone who knows what it is on Gunbroker I could see $700 or more