is it possible to make the soned assault rifle early?

I hear theres a little vanadium on Eos. There is also kett and eirochs. So is it possible to get all the resources needed without buying any of them which you coulndt if you had the money. Before even helping the scientests on 2nd story mission with the radiation still there could it be done? getting the alloys and all?. I have not played any MP yet you dont loot enemies  in apex missions right? So you could not do it that way.