Just a word on behalf of platers, they aint all like this, I have used one for several AA springers, and they have always been devoid of plating inside cylinders and barrels etc, threads have needed cleaning such as on scope mounts but thats all

Sorry you had so much trouble with this one, I think the cylinder might be saved but would always notice cosmentically, unless you went for a good old matt black paint finish

Baz