size of gas line

 i recently bought a new braided gas line cuz i thought my original one was leaking but it is a different size.  I have the A-5 and was wandering how i can change the size (diameter) of my line, and which is better; a bigger or smaller line.  i would think a smaller diameter line would use less co2, but what effects would it have on the gun? has anyone out there changed this and if so what is the best way. im planning on getting an expansion chamber so i wanted to get your input to see what was best (type and size of line) another thing, do i need to buy a whole new end (the part that screws into the tombstone adapter) or what cuz all the lines ive seen have screw in ends and not just the cupling. thanks to all that respond.

one line looks like it is about a 5/16 and the other is maybe a 3/16 in diameter. help any?

^^^^ wut he said, and about the whole screwin in the tombstone crap, if u buy a expansion chamber then ur gonna have to screw it in there ne ways so don't worry about that, but if ur talkin about the actual piece that u screw it into then i can't help u there.