Something that I find to be a head scratcher though, is not many buyers see value in barrel "grade". A higher priced PCP does not translate to higher chances of getting A-grade accuracy. Everyone that I know that is hardcore about accuracy for long-range and BR winds up spending time, money, and effort with barrel smithing to turn a "B" grade barrel into an "A+" - but the airgun might as well have an un-rifled tube in it when it comes to resale value; people do not seem to care.
I think it also boils down to the luck of the draw. I’ve bought at least 25 used high end Airguns over the past 3 years. All but two had very good barrels once the barrel was cleaned and polished, less than a half hours work. Only two of them, no matter what I did, couldn’t be made to be “sufficiently accurate.” By that I mean penny sized 5 shot groups at 50 yards and no worse than 1.5 MOA 5 shot (real groups) at 100 yards. Every Daystate Renegade (3), Cricket (4) and Vulcan (4) were MOA at 100 yards. The gun I won (Sportsman) EBR with last year was a used .30 FX Bobcat I bought three years ago. Maybe I’ve had good luck with used guns, or maybe I’m not hardcore enough, or maybe I’m not into distances much past 125 yards, who knows. But if you can do basic mechanical work, reseal the gun, clean and polish the barrel, and tune the gun for best performance, your odds are good too being lucky with a used gun.
People might not seem to care about barrel quality because of all the Keyboard Airguns for sale used. What I mean is that every gun is advertised as “hole in hole at 50 yards and well inside MOA at 100”. So when someone actually did spend time and money on their barrel, it can’t be distinguished from all the other guns listed for sale. I think If someone “hardcore” was selling a gun that he knew was special, with a special barrel and extraordinary accuracy to the point he felt he deserved more $ than the usual gun, he would offer some sort of accuracy guarantee. Maybe that would distinguish his gun from every other gun being sold?