Hey I am building my Father an Ar-15 for christmas. We went to a gun show and he said he always wanted one but he doesnt have the money to buy one. So I figured I would suprise him this Christmas with an Ar. I am trying to find an upper reciever ready to put on a lower for around $300.00. This price is flexable, I can go up but my pockets are not deep. So please if ya could help me out that would be great. Thanks.