Battle arms upper receiver - Battle Arms Development 5.56 Caliber Lightweight Upper Receiver, Gen2

This is one of the premium, lightweight, Upper Receivers on the market. It also has an incredible, hi-tech look to it. The price is good at Optics Planet, but I suspect BA is sending their blemished items to OP. I sent the first one back for radial machine lines below the ejection port. The second one I got back was worse. When I studied BA's website I could see some lines in their "Studio" photos too. So I guess they just can't get this area machined without some marks below the port. Anyway I just kept it. At least you can't see it after the port door flips open. And it's not really horrible.