im having trouble with my rear arb. It will leak, then re-seal itself. But im being told that the new design arb has is really picky on whether or not that copper line touches ANYTHING at all in the housing. So I have been removing/installing/removing/installing my third a few times to no avail. I know the seals are good, cause Marlins shop pulled it apart, I guess this newer design is better :bull crap: my front HP works like a champ though! good luck on whatever decision you make
