Yes. If while in carrier mode, you leave Metroplex's kneecaps in their 'robot-mode' position, the red plastic that they connect to (which runs along his legs) has 5mm holes on the reverse side of it (the deck-side of the carrier mode). You can then mount guns into them. While I don't have GoW3, I've tried this with Metroplex's standard black guns and it works pretty well. Plus, the holes run down the sides of the deck, so there's still some room to use the runway if you want to put other figures on it. EDIT: This pic demonstrates what I mean (no doubt it'll work with TFC's guns as well).