Take the best feature from each version of the weapons in this list and combine them if you do not know what I just ask and I will give you an example
Halo Reach Grenade Launcher
Halo Reach Needler Rifle
Needler
DMR
Halo Reach Concussion Rifle with a slight damage boost
Magnum
Shotgun
Assault Rifle
Plasma Rifle
Plasma Pistol
Sniper Rifle
Halo 2 Particle Beam Rifle
Halo 2 Carbine with the green shots
SMG
Fuel Rod Gun
Spartan Laser
Gravity Hammer
Brute Shot
Halo 4 Sticky Detonator
Rail Gun
Saw
Suppressor
Binary Rifle
The Shield upgrade system needs to be improved as well even when fully upgraded it’s pathetic