Clearly, possession of that magazine requires you to build a rifle to match.
It's like a rule.
Lol. Actually, saw some .222 ammo at Walmart a couple days ago. Don't currently own a .222, but remembered seeing EQFD193's nice collection of Sakos and thought, Hmmmm.
I remember seeing an AR15 in 222 a long time ago. I"ve not seen a mini14 in it but I don't look at ruger stuff generally and certainly not junk like a mini so I may have walked by one and not realized it in stores or gun shows back in the day before all that got overly boring.