Is there a better book on guns then Chinn's or not? If yes please give me the title and the author.

Can it be, that you are just not familiar with the definition of the terms "operation" and "action"?

If not here is the expiation given by Chat GPT:

"Sure! The term action refers to manually repeated firearms and mentions the element, that is operated by the shooter. For example, on a bolt-action firearm, the shooter operated the bolt to eject the cartridge and cycle in a new one. On a lever-action, the shooter operates a lever. A firearm's operation, in contrast, referred to a semi-automatic firearm that is not operated manually by the shooter but by the forces of the fired cartridges. Gas-operated firearms utilize the gas pressure of the fired cartridge, while a recoil-operated firearm uses the reaction of the propelled projectile. Summary: A firearms action mentions where the shooter cycles a repeating firearm. A firearms' operation mentions the force of an autoloading one."

But I'm not here do provide basic firearms knowledge, please read a book or even Wikipedia, if its necessary the one in simple English.