If you body block nicely for your Pd's you can stop the gun acu with t2 suite just fine. And the moment gun didn't manage to roll over your position he is royally fucked and not only him, but also his teammates as they will now get TML'ed.
Also, why are you feeding your units to your opponent, move them back. Make him pay for getting into his firing range. It's ACU you can out manouver it even with friggin aurora spam. If anything veterancy is the thing that actually allows the rambo playstyle to be even properly viable in team games. Otherwise there's literally no reason to go gun when T2 suite is just so much more flexible.