it seems to have the 20 rd mag as well as no slot for oiler- also no cut in hand guard-I doubt was a mock up made of something not made--I remember reading someplace about the invention of the oiler and slot being done by Winchester engineer after the prototypes winch were done--5?? memory?? I do not remember them having the the oiler cut--the first 20 made by inland had the oiler thing but did not have the cut in hand guard--again memory