The ion blaster is Optimus Prime's primary weapon. Only used by the leader of the Autobots when all attempts at peace have failed, the ion blaster ensures that freedom is the right of all sentient beings, and strikes fear in the sparks of the Decepticons who are foolish enough to challenge him.
- In the original toy and the original cartoon, Prime's weapon was refered to as a laser rifle, but many newer toys have called it an ion blaster.
- One notable aspect of Optimus Prime's Generation 1 and Generation 2 toys is that the handle of his weapon was unable to fit in Prime's hand, and can only be held by the ammo casing. Also, the gun's rifle but is too large to hold it straight, and must be held at an angle. Strangely, this has never been altered in reissuings.
- When he Transforms, Optimus Prime's ion blaster collapses into itself and is then thrown into his back, and subsequently his engine cab. So that is where it goes.