https://www.ebay.com/itm/23447829187...UAAOSwwKhiOqcn
If anyone's been wanting a regulator cap for a stainless steel valve (it looks like the one I have made by MCBer Deus Machina a decade ago) here's your chance.
Not sure how it airs up and shoots well without a regulator and straight 1800psi of CO2 to the valve though...