I have a stealth and it is the best gun I have... I have not nor will I tune it as I have no need to. It's more than adequate for dropping bunnies at around 35 yards. I have a hawke mildot scope and it is clinically accurate. Once i have aquired my target and zeroed in, it will launch a lead wasp with deadly accuracy. Out the box, no mucking about with it, just put pellet after pellet through it with no problems. If I got an FAC AIR I would get another one of them. Can't fault it and the fact it breaks down into a laptop bag etc is even better.... Buy one. But do not dabble with it or you will