VINTAGE MARLIN SCOPE MODEL 400A 4X32mm WITH MOUNT

That would make an excellent scope for your rifle---EXCEPT. It's a "vintage" scope, which means, while it's probably a good scope, it won't have the coated glass in it that will compare to even the cheapest made scope of Today. Second, it is costing a bunch more than I would pay for a scope, other than having the name of Marlin for something other than a collector would want. Being a vintage scope, the scope's seals might be cracked and it may of leaked out it's gas to keep it from fogging up. It was probably made by Weaver or Redfield which are good scopes, because Marlin DID NOT MAKE scopes. They had scopes made for them with their name put on it. Even though it comes with scope rings, they might not fit your rifle which would be a shame to order/purchase a scope with rings, just to find out they don't work. If you don't know what kind of rings your rifle requires, you need to see a gun retailer to help you find out and get ones in either silver or black of your choosing. This way you positively have rings you know will work for your rifle. ALSO. Rifle scopes/rings of years long past for rimfires, were made in 3/4 inch diameter. Today's rimfire scopes are 1 inch or 30 millimeter in diameter----just like centerfire scopes(to keep costs down), but a couple of Today's scope makers make 3/4" models, but you'll pay very good money for one. Yes, I've seen the cheap Tasco scopes in WalMart for a rimfire in 3/4 inch, but I wouldn't get one of those, because they're made more for a very low cost BB gun.
Del