Which tools are best for working on Air guns?

[Heugher]

You can also get copper pads like this too which would be even softer than the steel ones.

Not wishing to divert from the principal topic of tools on this thread, to protect the outside surfaces, I have to commend Ballistol, both their original and specific Gunex versions.
They work well on rust and provide a protective coating on the wood and metal. It is more than a coating, you are anointing.