I think that sandbags could be and option, but using them would increase time needed to deploy the gun. Also while sandbags would provide good cover against small arm fire they should get damaged (and eventually destroyed) by heavier weapons (like Burst Cannon or Heavy Bolter) and heavy weapons should blow them away with few hits.
Also I just found this mod, and I'm really impressed, keep up the good work.
ripper1234
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