In the West Kingdom you can fight in a 16 ga helm. It's just not recommended.
Where do you live again? I can link you to your Kingdom's Heavy Combat, Rapier, and Cut & Trust rules if you like.
That would be much appreciated.
I actually am not sure what my helms gauge is.
It was bought by my father on eBay. All I truelly know about it is that it's iron and isn't 1 solid ingot or piece.
How can I find out what gauge it is?
Btw I live in P.A. Eastern kingdom.
( the land of cheesesteaks)