Particle cannon

There have been a few Transformers with particle cannon weaponry. The most well known is Galvatron's primary weapon. It is attached to his right arm and is devastatingly powerful, as is to be expected from a weapon forged from the remains of Megatron's favoured fusion cannon, which itself could be combined with Megatron's stock and silencer to form a Particle Beam Cannon.

History
Kimia Facility transformed into a gigantic particle cannon.