The amount of ammo needed to open the left door in the final boss fight is crazy! You need to waste your heavy to open the door up every time you need to go in/out. Primary ammo will not open it up. If you shoot too many times it will close on you before you get through and it crushes you to death.
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Playing Solo on my Warlock, I’m able to open the door using a [b]VS Pyroelectric Propellant[/b] at 600rpm (although it does take the entire clip to open the door fully). (΄◉◞౪◟◉`)