Overclock is not restoring the room’s hardlight projectors, he’s fixing Simulus since the EMP has, temporarily disabled disabled Simulus’s own hardlight and holomatter capabilities.
And on the matter of his “bullets,” it’s just easier to refer to it as such. The following is just explanation/discussion, not an argument, I’ll still be replying to the move.
The neutron assault rifle is an energy weapon, though there are differing descriptions in how its functions. I can’t find the exact wording for the War for Cybertron game variant (which is what he uses), but it is said that,
“The Neutron Assault Rifle distorts the equilibrium of its target by blasting it with sonic booms. Once disoriented, the attacker can close in with a melee attack.”
Though this does greatly conflict with Fall of Cybertron’s description of, “Reliable automatic rifle fires hyper-piercing, heated neutrons at 600 rounds per minute.”
So, I just lean towards lighter, rapid energy “bullets.” Especially since if they just disorientate targets, I don’t see how the rifle could kill enemies in the game.