IIRC, same action as the 541. I remember seeing them in the catalog, but I can only recall seeing one, ever, in use. I was on my high school rifle team around that time, and a girl on the team had one. Her father owned a local sporting goods store, and had ordered it for her because she didn't like the DCM provided rifles (a couple of Remington 40xs, a handful of Winchester 52s, and a whole herd of Mossbergs).
She was a remarkable shot with it, and did quite well.
