And don't swallow the pill for the brass screw fitting that has the compression ring attached. I think a lot of gas lines are sold with this fitting as part of the "package."
These are supposed to work by "shearing off" the compression portion and then acting like any other compression fitting. Clue for the clueless - they don't.
In fact, as trouble free and reliable the old fashioned two piece screw nut/compression ring is in real life, for you if you're like me, the combined screw nut probably won't seal - and you'll have a gas leak. And you'l have a gas line from which you can't get the ring OR screw nut off of. As in either cut and shorten the line - or throw it away.
THIS is the fitting you want.
Joe K