Maybe. But you will need to do further research to try to determine if this book was ever offered in a hardback version.

You have to consider the possibility that the book was rebound with a hard cover at some point. Bookbinding used to be a thing. It is still done, but the craft isn't as common as it once was. A good bookbinder or rare book expert might be able to determine if your Mauser book was rebound.

Originally Posted by Geoff Roznak
The NRA has proven itself unreliable and corrupt. Period.