You're pretty much only going to get a regulated gun in the real high end, read pricey rifles. I wouldn't pass up a nice shooting PCP that did all I wanted it to do just because it wasn't regulated. I haven't shot a B50/B51. They are a semi clone of the old Daystate Huntsman. They are a decent gun if you do a bit of fiddling to address some of the issues they have. If I were going to buy a B50, I'd get one from Big Ed. For a very reasonble cost, not much more than buying one from Best Gun, or Sportsmans Target, he'll sell you one that he has gone through that makes it a lot nicer shooting, much more reliable rifle.