Not really, my thoughts are that when refurbing, certain factories were tasked with trying out new parkerizing type coatings, I have a few different "parked" sks some I like and some not so much, but they are all tough! I guess like most countries/manufacturers, in the 60's they were coming up with more durable coatings. The blued ones still look the best to me and of course for collecting, but as for the bottom of the barrel,,, no,,, my refurbs with parkerizing have great internal parts and are as tight and sometimes tighter than the blued copies, the bores of mine so far are really good, look new! Ymmv!