Anyone running one? I've got one that cycles ok with my mystic and booster. But I'm trying to improve the port pop and get it to run with a magic switch. Who's changed their recoil spring and to what weight? I know the stocker is 17#. I was thinking a 20# one. I know 19# is a common upgrade. But I need a little more umph for locking back into battery besides the normal. Plus I think it'd slow down the cycle rate a bit as well.