Good catch. Don't let facts get in the way of a gun grabbing story!
FWIW:
Ruger AC 556. Title 2 NFA. Approx $10,000.00 depending on configuration and accessories:
Ruger AR 556. Semi auto AR 15 clone. Title 1/modern sporting rifle.
Oh, it was an honest mistake...
Mini 14,
Sweet looking,
Crap for Accuracy.