both do look awesomely delicious
well for lack of that nice mill, on my part, I'm not using an O-ring either, although I have to say, that gives me the ability to optimize the insides of the cavity even better, PG. works better than solder, IMO... if it is applied correctly, getting it to spring a leak.... well ya... I've not yet managed that one....
beside, if you have 2 virtually 100%flat surfaces clamped together, and you add a small amount of sealing flexible substance, the possibility of a leak, at the pressures we are talking about....