winchester model 77 22|Winchester .22 Rim Fire|Forum|Winchester Collector

I have a model 77 that was recently left to me by my grandfather.  It is a tube fed.  When i put shells in the tube they fall directly in to the stock and do not feed.  I have to take it apart to get them out. I know im missing a part at the bottom of the tube assembly but i cant seem to get a name for the part so i can replace it. Please help.