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.
Cheers