The question says it all. My least favorite weapon has to be the beam rifle from halo:reach
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Can we just remove all forerunner weapons? Oh, the Halo 2 Brute Shot, Plasma Pistol, SMG, Halo 4 Battle Rifle, Halo 3 Assault Rifle, Halo Reach/Halo 4 Spartan Laser, Brute Plasma Rifle, and the Halo 4 Beam Rifle can go too.