Surely I can't be the only one thinking the original Beam Rifle, Carbine, and Jackal Shields need some love. We have had the Beam Rifle since '09 and the Carbine and the Jackal Shield since 2010.
The Jackal Shield needs to be scaled up to match the new style figures and the Carbine/Beam Rifle need to be scaled down to match the figures.
The Spiker, Mauler, and Plasma Rifle could also be scaled down.
I think the Gen 3 Shotguns need to be reverted back to Gen 2 molds to make them less flimsy. (I'm not talking about the Tactical Shotgun, I'm talking about the Halo 3 style shotguns). Gen 2 was a downscale of the giant shotguns, and Gen 3 downscaled them further. In my experience, a Gen 3 shotgun thin enough break if you rest a finger on it it the wrong way (I currently have about eight or nine broken Gen 3 Shotguns). I'll devote a Gallery topic to this later.
SPNKR style Rocket Launchers need to be slightly scaled down.
I would also love a CE, Halo Wars, Halo 2, 343, and Halo Reach variant of the Magnum to go with the Halo 3 version we already have.