Apologies if this has already been reported or it’s intentional, but I’ve seem to be able to take care of turrets very easily in science labs. I simply walk behind a closed metal door, and the turret shoots me as if I were standing there. I can repeat moving behind the door until the turret runs out of ammo, then easily kill it. Unsure if this works for other turrets. I discovered this whilst playing the experimental version 2745.
This part of a video I recorded should explain further.
http://youtu.be/EBWAYDq5v64?t=44m46s You won’t really need to watch on from 46:20 in the video.