If you show the maker and series markings on the left side of the receiver it would help with id . I do not think getting a mono-pod for that rifle would work as it looks like it does not have a pod band on it . A good id of the rifle would help to know what parts are missing if any . It may have also never had a dust cover either . Without better photos it is hard to tell , but the stock looks to have been messed with also .