I tried to find something on Cabela's where I could get a closer look. However, that does not look like a sidelock to me. Obviously not hand-detachable. But there appears to be a lack of pins/screws for a sidelock. Matter of fact, there looks to be a joint in front of the second screw from the front. If that gun's a sidelock and that's where the plate detaches, then it's a very different design from your typical bar action gun. The joint should be further forward, ahead of the front screw. But maybe that line I see between the two screws is just engraving. If so, still kinda odd.
