Contact Classic and send it back. Please keep us updated as to the response. I had an earlier transaction with Classic that was completely frustrating (service related, nothing to do with the firearm), but they have since seemed to greatly improved the customer service so I gave them another chance and my recent transactions have been fine. However, having said this, I recently purchased a 1911 from the same batch and was somewhat underwhelmed with the "handpick" option. Yes, I understand that an online purchase does have some risk and it was my decision so I accepted the risk. I am going to keep the 1911, however when I go to add another Swiss rifle I will go another route. That being said, if my 1911 had a crack similar to yours it would have went back the next day.
How was the packaging? Was the box bent? Mine was very well wrapped with bubble wrap so I cannot fault their packaging SOP. Classic does package very well (much better than Century).
Regardless, please let us know if you decide to return the rifle and how that goes.