How can I get more than one piece of salvage from enemy mechs?
If you disable a mech by "coring" it (shooting out the center torso), you get 1 part.
If you disable the mech by "legging" it (shooting out both legs), you get 2 parts.
If you disable the mech by removing the pilot (either shooting out the head, or causing enough pilot injuries to kill the pilot), you get 3 parts.