I wouldn't take a 16 gauge helm as combat ready, or a kettle helm in general, unless you're using a separate bargrill or some kind of extra protection. The single-piece kettle helms will get quite thin being dished out, vs the 4-panels which don't need to be dished/raised much. I'd settle for no less than 14 gauge for a combat helm, or 12 gauge if I could get it. You're talking head protection, IMO, it's better to overengineer than suffer serious injury. However ... I'd get a separate, lightweight helm, 16 or 18 gauge, for faire / non-combat wearing.