A guy I work with bought one yesterday, it seems very nice, especially for the money. He loaded it for the first time, and it is locked up. Theres a round in the chamber, it seemns to be fully in battery, and you cant move the slide at all. He called Diamondback and they said bad barrel send it in. He has to get the round out of it to send it in. What could be wrong with it, and can he safely shoot the round?