Laser Rifle: Same fire rate as DMR, longer scope, requires one extra shot to kill, no bloom.
Marksman Carbine: Sorta like a semi-auto Commando from Halo Infinite?
Service Rifle: Same as above but deliberately worse. Lacks a scope and has a slower rate of fire.
Plasma Rifle: High risk, high reward. 3 shots to kill, minor splash damage, but good luck landing your shots.
Plasma Pistol: Half-damage of the plasma rifle, slower projectile, double fire rate.
Anti-materiel Rifle: A fix for Reach's overpowered sniper rifle. Same projectile, slower rate of fire, requires user to stand still to be accurate.
China Lake: Extremely strong semi-auto, 4-mag capacity grenade launcher. Does not have EMP capability.
DKS-501: Something between a DMR and a Sniper Rifle. Second shot to the head can bleedthrough and grant a kill.
Missile Launcher: Smaller damage and splash than the Rocket Launcher but with a much faster projectile.
Tesla-Beaton Prototype: basically a front-loaded Spartan Laser. No charge-up but half the damage.
Light Machinegun: High-capacity bullet hose.
Fat Man: Handheld mini-nuke launcher.
Automatic Rifle: Meant to be strong when crouched and standing still.
Nephi's golf club: Energy sword functionality, grav hammer animations
Gatling Laser: uhhhhhh
Heavy Incinerator: Like having a ton of incendiary grenades from Halo 3, except it's a big support weapon that slows you down. You can backpack it, though.
9mm Pistol: Meant to be like Infinite's Sidekick pistol.
10mm Pistol: Bloom negated by a controlled rate of fire. Same projectile as vanilla Reach magnum.
Hunting Shotgun: Less damage, tighter spread, better range, faster rate of fire.
Assault Carbine: Consistent and accurate, but not a heavy hitter.
R91: Moderate damage and recoil
AER-14 Prototype: DMR with no bloom and no scope.
Recharger Rifle: Recharges one round per second, even when backpacked, but you can't tactically reload it. Otherwise similar to AER-14P.
Laser RCW: Sorta like the LMG, but more consistent at the tradeoff of some damage.