To get the LS-MOONLIGHT Laser Blade Part, choose the "Rescue Research Team" mission requested by Zio Matrix. Work your way trough the mission until you come accross a floating gate. Look down as you go through this tunnel and you'll notice an off-colored floor panel. Shoot out the panel and go down. Look at your map to see the indention in the wall where the laser blade sits. (coordinates: X -000055, Y -001982, Z -001094)