A lot of people have noticed the lack of guns in the Autobot ranks. We have axes, stingers, hammers, wrecking balls and giant flaming sword, but no guns. But I noticed so far we've met a maintenance crew, animatronic dinosaurs and garbage trucks brought to life, the possibly very ceremonial elite guard, and one intelligence bot, but no soldiers. And we know autobots do have energy weapons based off the Ark's cannon. So, it's possible that ordinary soilders are equipped with more traditional TF weapons, it's just that we haven't met them yet.