Well, you have an anomaly.
We look forward to mismarked revolvers for our collections and displays, but on a Mini 14, it's the first such mismarking I've heard of. Your Mini could be a whole display of only one gun. . And that also could garner the most scarce Ruger of the show.
i have no clue, but it should be with somethingI'm not a collector but seems someone found a nugget.
I use to be an 07 and currently licensed dealer. Go gauges say it is indeed a 556yessir I agree with peyton, may just be a "clerical error" so aside from all the markings exactly what caliber is it???? the Mini 14 magazines were rectangular, and the Mini 30 mags were tapered, narrow at the front.....did you black out the numbers?? box label does NOT match the receiver stamping, again what ammo "fits it"?????