A 56 should be possible. Swapping armor for speed loader would take the edge off the tight ammo route at the first elevator and shouldn't hurt survivability as long as armor is put on after the first slow-mo room. Minor mistakes including shooting too early at the window drop and taking 3 shots instead of 1. Lost killing spree for the second to last room.
RNG can save time too in the top right. A black suit by the door will open it, saving the need to snipe entirely. A dog will bark, bringing the enemy in the back on to screen sooner. If you get a heavy gunner you have to open the door because they live through sniping, wasting 1-2 seconds.
To anyone interested in submitting a run, at least one mod (Wavuvi) is checking for new runs multiple times a week. Remember to jump cancel your shotgun slowdown and turn off ALL skills (including team) for fresh runs!
