I did find one auction for the slightly newer 46M(b). It was missing both sling swivels but was otherwise in pretty good shape. It went for $153. It did not have the scope.
There's no rear iron sight on my 46M(a), but the scope sits so low that it may have come that way from the factory, being a Mossberg mount and scope. The front sight assembly has a couple moving parts and swings down to the side, partially retracting. Not sure just how that operates yet, though with the scope it's no issue anyway.
Sure is a fun little gun to shoot. I put some shells through it, and it handles really nicely and seems quite accurate. Balance is excellent, I really like the safety, and the rifle has an unusual look. I'm not interested in selling it. A guy just likes to know what he's got, ya know?
Kinda wish still I lived down in gray/fox squirrel country. Maybe have to get a small game license and go on the lookout for snowshoes. We're a bit too far northeast in the Arrowhead for cottontails.
Here are some pics. There's actually very little rust on barrel and scope. My POS P&S made things look really red, and I didn't feel like fooling around with them in Photoshop.