There are several methods to get the lowest heat sink buried in the rubble. The most effective way is to try and turn the arm to expose that heat sink.
Others I hear use Patch fire weapons as they can go through the rubble. (bonfire rockets, pyro grenades, Incendiary grenade launchers.)
BMG work sort of well if even a little bit of the heat sink is exposed the BMG links and does damage. (very little damage but damage nonetheless.)
However the preferred method is to turn the arm and smoke the heat sink with an LMG.


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