Chief has magetic energy weapons, gas powered magazine fed hyper sonic projectiles (rail guns), chemical explosives, nuke fusion reactor, and beam weapons.
The plasma weapons are magnetically controlled, it's how they keep their shape and seek some what.
Most of the projectile weapons are gas powered, the Sniper Rifle most noticably, the Gause Cannon and MAC Rifle (Book) shoot their single shot projectiles at hyper sonic speeds.
The Rocket Launcher is a chemical explosive.'
The Fuel Rod gun is basicaly a semi-automatic rocket launcher, very powerful.
The small scale fusion reactor in his suit blows up like a mini-nuke if he dies, or if he decides to self-destruct. Explosion so powerful there would be nothing visible left of the suit.
The Fuel Rod CANNON not GUN, CANNON and the scarab guns are beam weapons.
Iiiiiii rest my case. 😄