I'm new to fire arm repair so please don't tear me down. I recently picked up a Winchester Model 1873 Octagon in .44-40 WCF. It's missing some parts. Written on top is "Winchester Repeating Arms New Haven CT. It has an Octagon barrel and overall is in good shape. Its missing the slide on top that should close when you shut the lever and a screw that a sling would attach to at the front of the stock. I know the parts need to be time correct and I wont touch a thing until I make sure its not going to hurt the value. Any help would be appreciated SEE NEW PICTURES BELOW