Chrome Moly steel is what most rifle barrels and bolts were made of thirty years ago before Stainless got real popular.
In the White means no finish, not blueing or plateing of any kind. BTW blueing is just a form of controled rusting once the patina is on that tends to block blocvk deep rusting as long as the steel is cared for and kept oiled lightly. It will still rust pit of neglected though.