Just to give you an idea on price. I sold a nice kit couple months ago for 1,200. It didn't have a rec. Only 1 barrel. 1 ch. handle. 1 bolt. So this is a really good deal at this current price.
I would have to agree, it's still not a receiver. If your worried, if you win the auction just ask the seller to cut the rear of the receiver. But I don't really think that would be needed anyways.