I've managed to put my front barrel section on my 08 on to tight. Problem is I can't remember which way to turn it to get it off and want to avoid tightening it even further to compound the issue.
Pour hot water over the joint to expand the metal and use tea towels etc, to protect your hands, as Kev said reverse threaded so turn it the opposite to undo.
Stick it in a tub of oil. I tried everything once to get a barrel undone (rubber gloves, strap wrench, heating, cooling ect ect) leaving it in oil for a week loosened mine up.