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28 (including grenades and support weapons)- Here's a list of them.

Beam Rifle, Covenant Carbine, Energy Sword, Fuel Rod Gun, Needler, Plasma Grenade, Plasma Pistol, Plasma Rifle, Plasma Cannon, Brute Shot, Firebomb, Gravity Hammer, Mauler, Spike Grenade, Spiker, Assault Rifle, Battle Rifle, Flamethrower, Frag Grenade, Machine Gun Turret, Magnum, Missile Pod, Rocket Launcher, Shotgun, SMG, Sniper Rifle, Spartan Laser, Sentinel Beam

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