I bought a RRA upper at the indy gun show this weekend and wanted to buy a lower so I could yote hunt with it this year. Found one I wanted but when the lady came back to me she said I was too young to buy it (few months short of 21). So I can't buy any sort of lower until I'm the "right" age the government says? Even if it has a fixed stock on it? Is it legal for me to buy a lower off of an individual that didn't buy it with the intention of selling it to me?