Posted 04 September 2017 - 01:12 AM
Bear in mind that far from all of the mechs in-game have been updated to properly reflect all of the newtech weapons.
There is a list in several parts spread across the last few patch notes but off the top of my head I think anything that recently got a hero (ie Resistance mechs, Clan wave 2 and 3 mechs) plus a few others have been updated, with more in the pipeline (most likely the next mechs to get heroes will be the priority mechs for the retrofit, ie the Origins IIC mechs). They've already stated that they'll be updating them progressively