Yeah, it is polished stainless steel. I took a picture of it with the brass kraken on the top on the first day I got it. Here it is. I will update with a new (better) picture that you hopefully be able to see how the originally gold plated parts are now polished Stainless Steel.
It is a 23mm mod
Do you happen to know if there is a 18490/500 or 18350 copper tube/version out there?