Use the carbine, but change it's loading capabilities so that he can eat metal to replenish his ammo liek snuffy.
Chairman has Jack incorporated both the CARBINE RIFLE and the JETPACK! He is now an unstoppable airborne killing machine. The JET ENGINES increase his already considerable speed and he has turned the RIFLE into a powerful FIXED CANNON he can deploy in battle. Like Snuffy the Pooch, he is able to process metal objects into ammunition.
He seems anxious to charge up and try out his upgrades.
The Lord Protector speaks up. "I believe you, Everyman. I'm sorry for the way we've treated you. Will you really help us against the followers of the Icosahedron?"
"Hold on," Arek chimes in. "If what you say is true, then the followers are right. Is it ethical to cease the operation of the forces of nature for our own preservation? I do not wish to die, but I don't know if I can live with myself now that I know the truth."