Both contendernut (Fred has 2 different bars) and PJ are correct (Fred will do whatever you want when he makes the barrel).
However, if you have any TC factory forends with single hole mounting, or a Pachy forend, they will both mount to the Bullberry barrel bar. You have to rotate the bar 180 and swap it end for end and remount it to the barrel to do this. These are from the way the bar comes pre-mounted for a Bullberry custom forend. The hanger bar really works, so if you can use it, do so, even if you have a TC 2 hole forend and have to drill a new hole.
HTH