I realize this is an old thread but I felt I needed to say something anyway. I picked up a Mk5 several months ago here in Montana for $600.00, all serial #s matching, even the # painted on the buttstock in fading blue paint. Strong rifling and not a speck of rust anywhere. Having to retune the magazine lips to get it to feed reliably with my handloads but making progress...is the reason I joined this forum. Ordered a Mk4 magazine a couple days ago from Numrich hoping to luck out and get one that might miraculously work well without any tuning... This carbine rested in my safe til just last week unfired what with my other projects taking up my time.