I'm not famialer with the rossi, but one thing you need to pay attention to is if this gun is capable of having a scope mounted to it without drill and tapping. If you need to drill and tap, better off going down to the local gun shop and having a gunsmith do it for you. Also, if you do need to drill and tap, this will decrease the value of your weapon.
i put it next to my friends 357 smith & wesson and it is identical to his i have adjustable rear sights and a screw to remove the rear sight so it looks like it would be pretty easy to mount a scope at least i think so
The rear mount for the site looks good, but I would question the screw for the front of the frame......If you are going to use those two screws holes, you may have to have the front one drilled out a little more and tapped......email rossie, they may have a scope mount that utilizes the screws..