1.) In the editor, place two units, one of which has to be "Rifleman (AT)".
2.) Preview, with "Rifleman (AT)" as the player and the other unit as "playable".
3.) At the standing stance, equip your PCML.
4.) Switch to the other unit.
5.) Look at "Rifleman (AT)" as you are playing as the other unit.
6.) Note lack of aforementioned bodily appendage.