Weapon-arms. I liked it at first but I much prefer hand-held weapons. Funny how Optimus's last arm-weapon got eaten too. In the film I realized that every character was holding their weapon (besides Galvatron). Even Bumblebee and Stinger's arms didn't transform, their weapons were mounted. Crosshairs? hand-held SMGs. Drift? Hand-held swords. Hound? You get the idea.