Its probably lack of support (as well as consumer interest) in a 22WMR AR15.
Also lack of commonality with popular calibers like 22lr and 223. I would rather stock-up on those 2 calibers than have to add a 3rd caliber to the list.
I have an AR15 in 5.56 and a Ruger 10/22. I have no interest in a 22WMR even if they made one in AR form.
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