Well I've scratched the Manticore itch but I am tapped out on cash for a little while, atleast until tax return time so the Guardian will have to wait...picked up a 2 channel emerald (RB) manticore and I love it! The rattle is more than likely the set screw against the blade. I've got a custom 2 inch neck I'm adding which will have a second set screw, I'm willing to bet that 2 set screws and the blade going deeper into the hilt will eliminate all rattling within the hilt also heavy guage blade for added stilffness.
Hello Kal, the rattle on mine was on the battery holder part but manage to fix it with a simple sheet of paper wrap around it, all is good now