I think that both heat sinks and DHS should both be able to be used. After you buy the upgrade of course.
What made me think of this was that I have a mech that is a ton underweight with the weapon grouping I want to use. However I would like to pack on an extra heat sink or 2, but I cant because of the limited space. All that is left is just groups of 1 or 2 crit slots, where a DHS wouldn't fit.
I know I can max out armor or ammo, but I rather put it towards heat. Caustic Valley and all....
