Plenty of holdunder!
I have one of these which I purchased in the early nineties. It's the .177 version, with a rifled barrel. I've tried adjusting the sights but it's still wildly inaccurate; at six yards I have to hold under by about six inches and slightly to the left. When I do that, it's perversely satisfying watching the pellet curve up and strike the target. I hear that its muzzle power is only about 2 ft/lbs. I'm not entirely sure what to do with it. Even my son and young cousin are giving it a swerve!
Air Arms Pro-Sport .22 cal walnut stock (2019), BSA Supersport .177 cal (1999), British Diana Model 27 .177 (1950s), Umarex 850 M2 .22, Webley MkVI Service Revolver .177 pellet (2019), Sig Sauer XFive .177 pellet, Colt 1911 pellet.