Looked rather like a Winchester M70 to me.
Yes, the bolt does go in about as easily as depicted, but...
Remember, it's a MOVIE, it's FICTION, it is some WRITER'S idea of what a chain gang guard's idea of security for his rifle might be like if he thought about it like a Hollywood writer might if he knew anything about guns. Real shooters don't dink around with their equipment that way.
Looked rather like a Winchester M70 to me.
I wondered if it was a lightweight version of a M70. Having experience with one, I did get that impression from the bolt.