Thread: What kind of metal finish is this? And how do I fix it?

I threw a few small parts in the tumbler for a couple of hours and it seems to have done the job, looks to have taken it back to a chrome finish. I'd put the rest in but I'm not keen to strip the action. I think I'll mask the wood and try a buffer wheel.

I know it's a cheap shotgun but it seems to shoot bloody well so have no intention to replace it.