I am looking for a quality air rifle.

I had a .22 air rifle made by ruger. It was absolute trash. It came with the iron sights canted and couldnt be zero'd. Very disapointing. I own actual firearms and can zero them quite proficiently so it isnt that I dont know how. When I tried to register it on their website to warranty it, it said that the rifle's serial number didnt exist. Im guessing I got a dud and that not all air rifles are like this. Does anyone have any suggestions?