Invincible generators? (FNIX Rising)

I am currently trying to complete the two side missions from FNIX Rising in which you are tasked to destroy a couple of energy generators. However, it seems I can pump round after round into those things, and even several grenades seem to only scratch their surface.

What am I doing wrong?

[edit] Nevermind, it only took a couple more rounds… those things are built to last.

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