I haven't used the airking, but I have a couple of the next model up Nikko Nighteater - 6x36 on a 22, and a 3-9x42 that I used on a 22mag for a while and now sits around as a spare.
They're solid reliable scopes and good value, but optically well behind the Nikon Prostaff Rimfire I also have - clarity etc is quite noticably better on the Nikon.
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