The Transformers' physical weapons are partially irrelevant - It's all just Energon Power.The weapons used by the Transformers are not based on their physical hardware alone, but on using the physical hardware as a channel for Energon power (the same stuff that gives them a Battle Aura), much like speaking aloud spells which can be used through thought (or hand signs in Naruto) - it helps to concentrate them to their purpose. The more power you have, the more you can do with it. Scattershot is clearly shown firing Frickin' Laser Beams from the end of missiles (he also fires lasers from his wrists with no visible blasters on them). On the rare occasions he actually shoots these missiles as missiles, they always return/respawn to his body offscreen. Many such incongruities are displayed by many characters. The lasers/missiles are just blasts of Energon energy, and could theoretically be fired from the palms of the Transformers' hands, it's just easier (and Cooler) to use the physical weapons, especially if they're a BFG. As the series' power levels increase, Transformers are shown to use Energon energy for purposes their physical bodies clearly are not capable of, such as Starscream's telekinetic rocks shortly after his Awesome Moment of Crowning. The most clear demonstration of this is Megatron/Galvatron. At the beginning of the series, he can shoot lightning bolts of pure Energon power from his bare hand, which have the same effect as the series' lasers. Much later, during his final battle against Optimus Prime, Galvatron modifies a small part of his transformation sequence to form an impromptu Chest Blaster Wave Motion Gun out of several pieces of armor. These are inert pieces of metal. In the same battle, later again, he is able to Ass Pull a BFS clearly made of pure energy from thin air. It's the same color as his aura. Go figure.
Scourge has a phobia of girls.