My scope mount is different. It mounted to the side plate and was hollow so you could still use the open sights and the scope on top. Good idea...poor execution. It would rattle loose off the side plate screws and loose zero. So I took it off.
Your scope alone is $300ish new. Mine is a pos BSA but I will get nicer glass later....this is my all time favorite gun. Out of ALL of them, long or short. I hope to add a "6 in the future.