I also have a 783 , chambered in . 270 Win , and I ' ve taken down quite a few deer with it . It shoots subMOA , reliably , and so far it ' s been an absolutely fantastic buy . Enjoy it . Don ' t shoot the first thing you see . Relax and enjoy being outside . Bring plenty of warm clothes . It ' s crazy how fast your body cools down when you ' re sitting stillCheers <| sep |> Yes , it was a small shaft they sent a little RC car with a camera on it and as I recall it ended up coming to a dead end at a metal door . Now don ' t quote me on this but I think I recall hearing that they were able to get around it and turns out the shaft just leads outward to the end of a pyramid . There are different theories what it ' s for I ' ve heard people say it ' s an air vent or maybe was used during the construction .