I ignored and thus missed the rotary magazine phenom of the late Sixties and early Seventies in the 20th Century, which was spawned and principally the territory occupied by the Ruger 10/22.
I came late to the party in the Eighties and Nineties via vintage Savage 99 rifles in .243 Winchester, 250 Savage, .308 Winchester and .358 Winchester chamberings. Better late than never.
So I was neither surprised by, nor skeptical of Ruger's application of a rotary magazine in their American Rifle line.
A rotary magazine is by design: "available space" efficient; dependable; smooth feeding and rugged.
The Ruger American Rifle magazine is no exception.
And being made of mostly Polymer materials, it is, IMHO, both state of the currently practiced art and price efficiency in rotary center fire rifle magazine to date.
Rating: 5 of 5 Stars!