I bought my Mk3 from a gun shop a few years ago, still going strong. When I bought it, it was firing at 1000fps, but I'm sure that must have decreased over the years. Still incredibly accurate and powerful. I've stuck with the stock sight, no scope needed for this beauty. With me at the trigger, so down to my mistakes, it hit a 50p piece from 100ft 3/5 times prone, with no gizmos at all. It's a fantastic rifle and you should definetly keep it. Maybe you ought to get the fps checked out for sure before you start hunting with it, just to make sure it is fast enough to be humane, also use some good pentraters.