What a very cool old Winchester!  It has been a shooter and has a lot of life left!  It is a tube fed that feeds through the stock similar to the Browning SA-22, Norinco ATD-22, Remington 24 or 241.  I have shot it and it is a very accurate shooter that functions flawless.  The last photo shows in the top the shot group at 25 yards with open sights (The other target was a different gun) The stock has been pined and repaired and feels very sold, however you can stil the the crack on both sides.  It has a 24" barrel.